chore(deps): update golang docker tag to v1.21.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
golang	stage	patch	1.21.5 -> 1.21.6

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[github-actions]

@renovate[bot] Images are available for testing. docker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-e02d6603\ndocker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-UBI-e02d6603

[github-actions]

@renovate[bot] Images are available for testing. docker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-bc7206d1\ndocker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-UBI-bc7206d1

[github-actions]

@renovate[bot] Images are available for testing. docker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-a14b466b\ndocker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-UBI-a14b466b

[github-actions]

@renovate[bot] Images are available for testing. docker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-ea199734\ndocker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-UBI-ea199734

[github-actions]

@renovate[bot] Images are available for testing. docker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-74141099\ndocker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-UBI-74141099

[github-actions]

@renovate[bot] Images are available for testing. docker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-e2b6ccd8\ndocker pull ghcr.io/stakater/reloader:SNAPSHOT-PR-601-UBI-e2b6ccd8