[8.11] build: bump go version to 1.21.3 (backport #11821)

[mergify]

This is an automatic backport of pull request #11821 done by Mergify.
Cherry-pick of d411924 has failed:

On branch mergify/bp/8.11/pr-11821
Your branch is up to date with 'origin/8.11'.

You are currently cherry-picking commit d41192417.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   script/update_go_version.sh

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .go-version
	both modified:   NOTICE.txt
	both modified:   cmd/intake-receiver/go.mod
	both modified:   docs/version.asciidoc
	both modified:   go.mod
	both modified:   go.sum
	both modified:   internal/glog/go.mod
	both modified:   packaging/docker/Dockerfile
	both modified:   systemtest/go.mod
	both modified:   tools/go.mod

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[axw]

#11654 needs backporting first.

[mergify]

This pull request is now in conflicts. Could you fix it @mergify[bot]? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.11/pr-11821 upstream/mergify/bp/8.11/pr-11821
git merge upstream/8.11
git push upstream mergify/bp/8.11/pr-11821