Merge pull request #34968 from alimaazamat/update-capz-plugin

Add CAPZ v1.21 milestone to plugins

Author: k8s-ci-robot

config/prow/plugins.yaml

@@ -537,9 +537,9 @@ milestone_applier:
     release-2.6: v2.6
     release-2.5: v2.5
   kubernetes-sigs/cluster-api-provider-azure:
-    main: v1.20
+    main: v1.21
+    release-1.20: v1.20
     release-1.19: v1.19
-    release-1.18: v1.18
   kubernetes-sigs/cluster-api-provider-digitalocean:
     main: v1.1.0
     release-1.0: v1.0.0