Ingress NGINX: Promote Kube Webhook CertGen v1.5.1.

Commit: kubernetes/ingress-nginx@3e8586b
Job: https://prow.k8s.io/view/gs/kubernetes-ci-logs/logs/post-ingress-nginx-kube-webhook-certgen/1878552570784387072
Build: https://storage.googleapis.com/kubernetes-ci-logs/logs/post-ingress-nginx-kube-webhook-certgen/1878552570784387072/artifacts/build.log

Author: Gacko

registry.k8s.io/images/k8s-staging-ingress-nginx/images.yaml

@@ -198,6 +198,7 @@
     "sha256:a320a50cc91bd15fd2d6fa6de58bd98c1bd64b9a6f926ce23a600d87043455a3": ["v1.4.3"]
     "sha256:a9f03b34a3cbfbb26d103a14046ab2c5130a80c3d69d526ff8063d2b37b9fd3f": ["v1.4.4"]
     "sha256:aaafd456bda110628b2d4ca6296f38731a3aaf0bf7581efae824a41c770a8fc4": ["v1.5.0"]
+    "sha256:0de05718b59dc33b57ddfb4d8ad5f637cefd13eafdec0e1579d782b3483c27c3": ["v1.5.1"]
     "sha256:39c5b2e3310dc4264d638ad28d9d1d96c4cbb2b2dcfb52368fe4e3c63f61e10f": ["v20220916-gd32f8c343"]
     "sha256:ccdb2382b53ed42fd76bfbff90a5b8a5815af0b3b8c6dfb9118a34770d9cac11": ["v20221219-controller-v1.5.1-49-ge3e0d9c1f"]
     "sha256:4d99688e557396f5baa150e019ff7d5b7334f9b9f9a8dab64038c5c2a006f6b5": ["v20221220-controller-v1.5.1-58-g787ea74b6"]