chore(librarian): fix version for grpc-google-iam-v1 (#16482)

The version for `grpc-google-iam-v1` was incorrect in
`.librarian/state.yaml` as `0.14.3` already exists on PyPI

https://pypi.org/project/grpc-google-iam-v1/0.14.3/

Author: parthea

.librarian/state.yaml

@@ -4179,7 +4179,7 @@ libraries:
       - packages/grafeas
     tag_format: '{id}-v{version}'
   - id: grpc-google-iam-v1
-    version: 0.14.2
+    version: 0.14.3
     last_generated_commit: e8365a7f88fabe8717cb8322b8ce784b03b6daea
     apis:
       - path: google/iam/v1