Merge pull request #35262 from mboersma/update-capi-milestone

cluster-api: update milestone applier for v1.11

Author: k8s-ci-robot

config/prow/plugins.yaml

@@ -520,7 +520,8 @@ milestone_applier:
     release-1.17: v1.17
     release-1.16: v1.16
   kubernetes-sigs/cluster-api:
-    main: v1.11
+    main: v1.12
+    release-1.11: v1.11
     release-1.10: v1.10
     release-1.9: v1.9
     release-1.8: v1.8