0.5.x: Remove everything deprecated #2871

Job	Run time
rust_msrv (ubuntu-latest)	1m 7s
rust_versions (ubuntu-latest, stable)	1m 3s
rust_versions (ubuntu-latest, beta)	58s
timezones (ubuntu-latest, ACST-9:30)	1m 30s
rust_versions (ubuntu-latest, nightly)	57s
timezones (ubuntu-latest, EST4)	1m 13s
timezones (ubuntu-latest, UTC0)	1m 22s
timezones (ubuntu-latest, Asia/Katmandu)	1m 15s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	15s
timezones (macos-latest, ACST-9:30)	46s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	19s
timezones (macos-latest, EST4)	1m 26s
alternative_targets (ubuntu-latest, aarch64-linux-android)	10s
timezones (macos-latest, UTC0)	1m 3s
timezones (macos-latest, Asia/Katmandu)	1m 12s
check-docs	20s
timezones (windows-latest, ACST-9:30)	1m 20s
cross-targets (x86_64-sun-solaris)	1m 9s
timezones (windows-latest, EST4)	2m 18s
timezones (windows-latest, UTC0)	1m 21s
cross-tests (ubuntu-latest)	1m 48s
timezones (windows-latest, Asia/Katmandu)	1m 26s
features_check (ubuntu-latest)	5m 33s
no_std (ubuntu-latest, thumbv6m-none-eabi)	18s
features_check (macos-latest)	10m 33s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	12s
features_check (windows-latest)	8m 53s
test_wasi (ubuntu-latest, wasm32-wasi)	26s
test_wasm (ubuntu-latest)	24s
	50m 37s

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