promote Ingress NGINX v1.21.4 base image

[tao12345666333]

Signed-off-by: Jintao Zhang zhangjintao9020@gmail.com

/cc @rikatz @strongjz

[upodroid]

/retest pull-k8sio-cip

[k8s-ci-robot]

@upodroid: The /retest command does not accept any targets.
The following commands are available to trigger required jobs:

• /test pull-k8sio-backup
• /test pull-k8sio-cip
• /test pull-k8sio-dns-validate-config
• /test pull-k8sio-file-promo
• /test pull-k8sio-groups-test
• /test pull-k8sio-terraform-kubernetes-public
• /test pull-k8sio-terraform-monitoring
• /test pull-k8sio-terraform-org-kubernetes-io
• /test pull-k8sio-terraform-prow-build
• /test pull-k8sio-terraform-prow-build-trusted
• /test pull-k8sio-terraform-public-pii
• /test pull-k8sio-verify

Use /test all to run the following jobs that were automatically triggered:

• pull-k8sio-cip
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In response to this:

/retest pull-k8sio-cip

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[upodroid]

/test pull-k8sio-cip

[saschagrunert]

/test pull-k8sio-cip

[rikatz]

/lgtm
Tks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rikatz, tao12345666333

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• k8s.gcr.io/images/k8s-staging-ingress-nginx/OWNERS [rikatz,tao12345666333]

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