Update to Go 1.24.9

[embik]

Summary

We updated to Go 1.24.8 in #3634, but that Go version has a known issue with parsing X509 certificates which caused some K8s upstream issues. Let's bump kcp as well to ensure we don't release a faulty build.

What Type of PR Is This?

/kind cleanup

Related Issue(s)

Towards kcp-dev/infra#136

Release Notes

kcp is built with Go 1.24.9

[embik]

/cherry-pick release-0.28

[kcp-ci-bot]

@embik: once the present PR merges, I will cherry-pick it on top of release-0.28 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0.28

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.

[mjudeikis]

/lgtm
/approve

[kcp-ci-bot]

LGTM label has been added.

Git tree hash: fc09fd8f50f5cf630857c547e6d18cd18ca35c61

[kcp-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mjudeikis

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[mjudeikis]

/retest

[kcp-ci-bot]

@embik: #3651 failed to apply on top of branch "release-0.28":

Applying: Update to Go 1.24.9
Using index info to reconstruct a base tree...
M	.github/workflows/docs-gen-and-push.yaml
M	.github/workflows/goreleaser.yml
M	.prow.yaml
M	Dockerfile
M	go.mod
Falling back to patching base and 3-way merge...
Auto-merging go.mod
CONFLICT (content): Merge conflict in go.mod
Auto-merging Dockerfile
CONFLICT (content): Merge conflict in Dockerfile
Auto-merging .prow.yaml
CONFLICT (content): Merge conflict in .prow.yaml
Auto-merging .github/workflows/goreleaser.yml
CONFLICT (content): Merge conflict in .github/workflows/goreleaser.yml
Auto-merging .github/workflows/docs-gen-and-push.yaml
CONFLICT (content): Merge conflict in .github/workflows/docs-gen-and-push.yaml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Update to Go 1.24.9
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:

/cherry-pick release-0.28

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.