chore(deps): update docker.io/library/golang docker tag to v1.21.6 (v1.12)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/library/golang	stage	minor	1.20.12 -> 1.21.6
docker.io/library/golang	final	minor	1.20.12 -> 1.21.6

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Configuration

📅 Schedule: Branch creation - "on monday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Never, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

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This PR has been generated by Mend Renovate. View repository job log here.

[aanm]

/test-backport-1.12

Job 'Cilium-PR-K8s-1.17-kernel-4.9' failed:

Click to show.

Test Name

K8sPolicyTest Multi-node policy test with L7 policy using connectivity-check to check datapath

Failure Output

FAIL: cannot install connectivity-check

Jenkins URL: https://jenkins.cilium.io/job/Cilium-PR-K8s-1.17-kernel-4.9/351/

If it is a flake and a GitHub issue doesn't already exist to track it, comment /mlh new-flake Cilium-PR-K8s-1.17-kernel-4.9 so I can create one.

Then please upload the Jenkins artifacts to that issue.

[qmonnet]

/test-1.17-4.9

[qmonnet]

/test-1.18-4.9

[julianwiedmann]

Rebasing to pull in an allow-list update for the IPsec upgrade test ...

[julianwiedmann]

/test-backport-1.12

Job 'Cilium-PR-K8s-1.16-kernel-4.9' failed:

Click to show.

Test Name

K8sChaosTest Restart with long lived connections L3/L4 policies still work while Cilium is restarted

Failure Output

FAIL: Found 1 k8s-app=cilium logs matching list of errors that must be investigated:

Jenkins URL: https://jenkins.cilium.io/job/Cilium-PR-K8s-1.16-kernel-4.9/324/

If it is a flake and a GitHub issue doesn't already exist to track it, comment /mlh new-flake Cilium-PR-K8s-1.16-kernel-4.9 so I can create one.

Then please upload the Jenkins artifacts to that issue.

Job 'Cilium-PR-K8s-1.17-kernel-4.9' failed:

Click to show.

Test Name

K8sDatapathConfig MonitorAggregation Checks that monitor aggregation flags send notifications

Failure Output

FAIL: Timed out after 240.001s.

Jenkins URL: https://jenkins.cilium.io/job/Cilium-PR-K8s-1.17-kernel-4.9/357/

If it is a flake and a GitHub issue doesn't already exist to track it, comment /mlh new-flake Cilium-PR-K8s-1.17-kernel-4.9 so I can create one.

Then please upload the Jenkins artifacts to that issue.

Job 'Cilium-PR-K8s-1.17-kernel-4.9' has 1 failure but they might be new flake since it also hit 1 known flake: #27118 (97.12% similarity)

[julianwiedmann]

/test-1.16-4.9

[julianwiedmann]

/test-1.17-4.9

[julianwiedmann]

/test-1.17-4.9