chore(deps): update all dependencies (#1245)

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: mukund-ananthu <[email protected]>

Author: 3 people

samples/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-pubsub==2.23.0
 avro==1.12.0
 protobuf===4.24.4; python_version == '3.7'
-protobuf==5.27.4; python_version >= '3.8'
+protobuf==5.28.0; python_version >= '3.8'
 avro==1.12.0