update version

Author: ohmayr

.librarian/config.yaml

@@ -3,4 +3,4 @@ global_files_allowlist:
   # file during the `release` step to update the latest client library
   # versions which are hardcoded in the file.
   - path: "CHANGELOG.md"
-    permissions: "read-write"
+    permissions: "read-write"

.librarian/state.yaml

@@ -1,10 +1,10 @@
 image: us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator:latest
 libraries:
   - id: google-cloud-pubsub
-    version: 2.32.0
+    version: 2.31.1
     apis: []
     source_roots:
       - .
     preserve_regex: []
     remove_regex: []
-    tag_format: v{version}
+    tag_format: v{version}