Bump Go version to 1.21.1

[rikatz]

Bumping go version before release
/triage accepted
/kind bug
/priority urgent

[k8s-ci-robot]

@rikatz: The label(s) priority/urgent cannot be applied, because the repository doesn't have them.

In response to this:

Bumping go version before release
/triage accepted
/kind bug
/priority urgent

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rikatz

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[rikatz]

/cherrypick release-1.8

[k8s-infra-cherrypick-robot]

@rikatz: #10377 failed to apply on top of branch "release-1.8":

Applying: Bump Go version to 1.21.1
error: patch failed: images/opentelemetry/rootfs/go.mod:1
error: images/opentelemetry/rootfs/go.mod: patch does not apply
error: Did you hand edit your patch?
It does not apply to blobs recorded in its index.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Using index info to reconstruct a base tree...
M	.github/workflows/ci.yaml
A	.github/workflows/golangci-lint.yml
M	.github/workflows/plugin.yaml
M	go.mod
M	go.sum
M	images/custom-error-pages/rootfs/Dockerfile
Patch failed at 0001 Bump Go version to 1.21.1
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release-1.8

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.