chore(deps): Bump go version to 1.21.1 (backport #2541)

[mergify]

This is an automatic backport of pull request #2541 done by Mergify.
Cherry-pick of cb82cc3 has failed:

On branch mergify/bp/v1.x/pr-2541
Your branch is up to date with 'origin/v1.x'.

You are currently cherry-picking commit cb82cc3.
  (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:   .github/workflows/ci-release.yml
	modified:   .github/workflows/lint.yml
	modified:   .github/workflows/test.yml
	modified:   README.md
	modified:   go.mod

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .github/workflows/nightly.yml

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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[rach-id]

Mergify say that the cherry-pick failed, however, the changes seem to be fine. Should I cherry-pick manually locally? Or just leave it like this?

[rootulp]

It looks like the nightly workflow wasn't backported to v1.x yet

[rootulp]

Mergify say that the cherry-pick failed, however, the changes seem to be fine. Should I cherry-pick manually locally? Or just leave it like this?

Agreed but I think Mergify is just bugging out b/c there are no merge conflicts. Both this PR and the original PR modify 6 files so IMO this looks good.

[rach-id]

cool, thanks. Approving