Ingress NGINX: Promote NGINX v1.2.3.

Commit: kubernetes/ingress-nginx@40060ca
Job: https://prow.k8s.io/view/gs/kubernetes-ci-logs/logs/post-ingress-nginx-nginx/1914994589144453120
Build: https://storage.googleapis.com/kubernetes-ci-logs/logs/post-ingress-nginx-nginx/1914994589144453120/artifacts/build.log

Author: Gacko

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

@@ -233,6 +233,7 @@
     "sha256:c4b3f79fb88eab2ac03bde5c6b8340ffad941e0fce0eaa797e98481683b3b5aa": ["v1.2.0"]
     "sha256:9ed93911ae01d8cf4d8b3de0e62e718d7a76ad59ef88dd51bb3b9f87ef443c9a": ["v1.2.1"]
     "sha256:a83b0c0d2988958d78b2b369a64cb77cdc6db3d1f632dc697837d7993cd7dbaa": ["v1.2.2"]
+    "sha256:6ba79cee5291382d1b6c7349153069bd3cdbd2b6f74878827d1d4c4f892964a5": ["v1.2.3"]
     "sha256:3e7bda4cf5111d283ed1e4ff5cc9a2b5cdc5ebe62d50ba67473d3e25b1389133": ["v2.0.0"]
     "sha256:0301aff18d076a3726a0c7c07c68db3218dc90d56a3ed419868e21c12114549e": ["v2.0.1"]
     "sha256:d150d220752ed7479a1a1400be69bcca7bf5bf4b49d0d48890927f086eef5e2d": ["v2.0.2"]