Update publishing-bot rules to Go 1.21.9

[cpanato]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

• Update publishing-bot rules to Go 1.21.9

should we drop the rules for release-1.26?

/assign @dims @puerco @xmudrii @Verolop
cc @kubernetes/release-engineering

Which issue(s) this PR fixes:

xref kubernetes/release#3529

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Please note that we're already in Test Freeze for the release-1.30 branch. This means every merged PR will be automatically fast-forwarded via the periodic ci-fast-forward job to the release branch of the upcoming v1.30.0 release.

Fast forwards are scheduled to happen every 6 hours, whereas the most recent run was: Sat Apr 6 07:40:02 UTC 2024.

[k8s-ci-robot]

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[dims]

@cpanato we still have 1.26 CI jobs, we can clean this up when go through the steps for cleaning up 1.26

/approve
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d7039ed1d4b106c1baf603856584b6d4656d9f1e

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, dims

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• staging/publishing/OWNERS [dims]

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[pacoxu]

milestone v1.30?
Next patch release date may be before v1.30.0 is released(planed in April 17th.)

[dims]

/milestone v1.30