[updatecli] Bump Golang version to 1.20.6

[apmmachine]

What

Bump go release version with the latest release.

Further details

See changelog for 1.20.6

---

Bump golang-version to latest version

Update .go-version with Golang version 1.20.6

Updated to content "1.20.6" in file ".go-version"

1.20.6

no GitHub Release found for go1.20.6 on "https://github.com/golang/go"

Update version.asciidoc with Golang version 1.20.6

Updated to content "" in file "docs/version.asciidoc"

1.20.6

no GitHub Release found for go1.20.6 on "https://github.com/golang/go"

Update Dockerfile with Golang version 1.20.6

Updated to content "" in file "packaging/docker/Dockerfile"

1.20.6

no GitHub Release found for go1.20.6 on "https://github.com/golang/go"

---

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[apmmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-07-15T20:05:58.396+0000

• Duration: 6 min 17 sec

🤖 GitHub comments

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /package : Generate and publish the docker images.

• /test windows : Build & tests on Windows.

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[apmmachine]

📚 Go benchmark report

Diff with the main branch

goos: linux
goarch: amd64
pkg: github.com/elastic/apm-server/internal/agentcfg
cpu: 12th Gen Intel(R) Core(TM) i5-12500
                                  │ build/main/bench.out │             bench.out             │
                                  │        sec/op        │   sec/op     vs base              │
FetchAndAdd/FetchAndAddToCache-12           101.40n ± 6%   98.38n ± 4%  -2.98% (p=0.028 n=6)
geomean                                      68.58n        67.52n       -1.54%

                                  │ build/main/bench.out │             bench.out              │
                                  │         B/op         │    B/op     vs base                │
geomean                                                ²               +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

                                  │ build/main/bench.out │             bench.out              │
                                  │      allocs/op       │ allocs/op   vs base                │
geomean                                                ²               +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

pkg: github.com/elastic/apm-server/internal/beater/request
                                             │ build/main/bench.out │             bench.out              │
                                             │        sec/op        │    sec/op     vs base              │
ContextResetContentEncoding/uncompressed-12            166.3n ±  1%   170.2n ±  1%  +2.35% (p=0.002 n=6)
ContextResetContentEncoding/deflate_sniff-12           3.977µ ±  1%   3.918µ ±  5%  -1.46% (p=0.041 n=6)
geomean                                                922.9n         913.7n        -1.01%

                                             │ build/main/bench.out │              bench.out               │
                                             │         B/op         │     B/op      vs base                │
geomean                                                           ²                 +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

                                             │ build/main/bench.out │             bench.out              │
                                             │      allocs/op       │ allocs/op   vs base                │
geomean                                                           ²               +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

pkg: github.com/elastic/apm-server/internal/publish
             │ build/main/bench.out │          bench.out          │
             │        sec/op        │   sec/op    vs base         │

             │ build/main/bench.out │           bench.out            │
             │         B/op         │     B/op       vs base         │

             │ build/main/bench.out │           bench.out           │
             │      allocs/op       │  allocs/op    vs base         │

pkg: github.com/elastic/apm-server/x-pack/apm-server/aggregation/spanmetrics
                 │ build/main/bench.out │          bench.out           │
                 │        sec/op        │   sec/op     vs base         │

                 │ build/main/bench.out │            bench.out            │
                 │         B/op         │     B/op      vs base           │
¹ all samples are equal

                 │ build/main/bench.out │           bench.out           │
                 │      allocs/op       │ allocs/op   vs base           │
¹ all samples are equal

pkg: github.com/elastic/apm-server/x-pack/apm-server/aggregation/txmetrics
                        │ build/main/bench.out │          bench.out           │
                        │        sec/op        │   sec/op     vs base         │

                        │ build/main/bench.out │           bench.out           │
                        │         B/op         │    B/op     vs base           │
¹ all samples are equal

                        │ build/main/bench.out │           bench.out           │
                        │      allocs/op       │ allocs/op   vs base           │
¹ all samples are equal

pkg: github.com/elastic/apm-server/x-pack/apm-server/sampling
               │ build/main/bench.out │             bench.out              │
               │        sec/op        │    sec/op     vs base              │
geomean                  438.4n         427.2n        -2.55%

               │ build/main/bench.out │              bench.out               │
               │         B/op         │     B/op      vs base                │
geomean                    382.5          381.9       -0.14%
¹ all samples are equal

               │ build/main/bench.out │             bench.out              │
               │      allocs/op       │ allocs/op   vs base                │
geomean                    3.742        3.742       +0.00%
¹ all samples are equal

pkg: github.com/elastic/apm-server/x-pack/apm-server/sampling/eventstorage
                                             │ build/main/bench.out │              bench.out              │
                                             │        sec/op        │    sec/op     vs base               │
WriteTransaction/proto_codec-12                       1271.0n ± 15%   688.6n ± 77%  -45.83% (p=0.009 n=6)
geomean                                                13.24µ         13.12µ         -0.91%

                                             │ build/main/bench.out │               bench.out               │
                                             │         B/op         │     B/op       vs base                │
ReadEvents/proto_codec_big_tx/399_events-12           1.252Mi ±  0%   1.253Mi ±  0%  +0.06% (p=0.022 n=6)
geomean                                               11.33Ki         11.36Ki        +0.28%
¹ all samples are equal

                                             │ build/main/bench.out │              bench.out              │
                                             │      allocs/op       │  allocs/op   vs base                │
geomean                                                  123.6         123.6       +0.00%
¹ all samples are equal

report generated with https://pkg.go.dev/golang.org/x/perf/cmd/benchstat