Upgrade nginx to security patch v0.25.1

[reegnz]

See ingress-nginx release notes for details:
https://github.com/kubernetes/ingress-nginx/releases/tag/nginx-0.25.1

[k8s-ci-robot]

Hi @reegnz. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[minikube-bot]

Can one of the admins verify this patch?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: reegnz
To complete the pull request process, please assign afbjorklund
You can assign the PR to them by writing /assign @afbjorklund in a comment when ready.

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[tstromberg]

@minikube-bot OK to test

[tstromberg]

Thank you!