Merge pull request #7918 from Gacko/wkkov

Ingress NGINX: Promote NGINX v1.2.1.

Author: k8s-ci-robot

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

@@ -229,6 +229,7 @@
     "sha256:11ee0d0e3d063f1468f9a82958d57fa0718614fe10b676941f4dea0aef091faf": ["v1.0.0"]
     "sha256:43e04f78d7544010e2e86918faae1d15091995b7ef6e522f53cf3035ad814567": ["v1.1.0"]
     "sha256:c4b3f79fb88eab2ac03bde5c6b8340ffad941e0fce0eaa797e98481683b3b5aa": ["v1.2.0"]
+    "sha256:9ed93911ae01d8cf4d8b3de0e62e718d7a76ad59ef88dd51bb3b9f87ef443c9a": ["v1.2.1"]
     "sha256:3e7bda4cf5111d283ed1e4ff5cc9a2b5cdc5ebe62d50ba67473d3e25b1389133": ["v2.0.0"]
     "sha256:0301aff18d076a3726a0c7c07c68db3218dc90d56a3ed419868e21c12114549e": ["v2.0.1"]