chore(deps): update ghcr.io/chgl/kube-powertools docker tag to v2.3.21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/chgl/kube-powertools	container	patch	v2.3.17 -> v2.3.21

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Release Notes

chgl/kube-powertools (ghcr.io/chgl/kube-powertools)

v2.3.21

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Miscellaneous Chores

• deps: update docker.io/bitnami/kubectl:1.31.0 docker digest to 7779e58 (#​464) (8c9caa3)
• deps: update docker.io/nginxinc/nginx-unprivileged:1.27.1 docker digest to 0569e31 (#​461) (0f758c7)
• deps: update github-actions (#​463) (b0063e5)

v2.3.20

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Miscellaneous Chores

• deps: update all non-major dependencies (8524f03)

v2.3.19

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Miscellaneous Chores

• deps: update all non-major dependencies (e9106ec)

v2.3.18

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Miscellaneous Chores

• deps: update all non-major dependencies (4af6ddb)

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