Merge pull request #35349 from sbueringer/pr-capv-milestone

Update the milestone_applier for CAPV v1.15

Author: k8s-ci-robot

config/prow/plugins.yaml

@@ -579,7 +579,8 @@ milestone_applier:
     release-0.4: v0.4
     release-0.3: v0.3
   kubernetes-sigs/cluster-api-provider-vsphere:
-    main: v1.14
+    main: v1.15
+    release-1.14: v1.14
     release-1.13: v1.13
     release-1.12: v1.12
     release-1.11: v1.11