Update Kops milestone to v1.33

Author: hakman

config/prow/plugins.yaml

@@ -499,7 +499,8 @@ milestone_applier:
   kubernetes/k8s.io:
     main: v1.34
   kubernetes/kops:
-    master: v1.32
+    master: v1.33
+    release-1.32: v1.32
     release-1.31: v1.31
     release-1.30: v1.30
     release-1.29: v1.29