Bump the docker group across 3 directories with 1 update

[dependabot]

Bumps the docker group with 1 update in the /images/cfssl/rootfs directory: alpine.
Bumps the docker group with 1 update in the /images/nginx/rootfs directory: alpine.
Bumps the docker group with 1 update in the /rootfs directory: alpine.

Updates alpine from 3.20 to 3.21

Updates alpine from 3.20 to 3.21

Updates alpine from 3.20 to 3.21

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: dependabot[bot]
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[k8s-ci-robot]

Hi @dependabot[bot]. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[netlify]

✅ Deploy Preview for kubernetes-ingress-nginx canceled.

Name	Link
🔨 Latest commit	2f77a6b
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-ingress-nginx/deploys/6756d1b7bb70110008199eef

[Gacko]

/triage accepted
/kind cleanup
/priority backlog
/hold