build(deps): bump protobuf from 6.31.0 to 6.31.1 in /samples/snippets (#1424)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

samples/snippets/requirements.txt

@@ -2,7 +2,7 @@ google-cloud-pubsub==2.29.0
 avro==1.12.0
 protobuf===4.24.4; python_version == '3.7'
 protobuf===5.29.4; python_version == '3.8'
-protobuf==6.31.0; python_version >= '3.9'
+protobuf==6.31.1; python_version >= '3.9'
 avro==1.12.0
 opentelemetry-api===1.22.0; python_version == '3.7'
 opentelemetry-sdk===1.22.0; python_version == '3.7'