chore(deps): bump protobuf from 6.31.1 to 6.33.5 in /samples/snippets

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 6.31.1 to 6.33.5.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 6.33.5
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

samples/snippets/requirements.txt

@@ -19,7 +19,7 @@ mako==1.3.10; python_version >= '3.9'
 markupsafe==3.0.2; python_version >= '3.9'
 packaging==25.0
 proto-plus==1.26.1
-protobuf==6.31.1; python_version >= '3.9'
+protobuf==6.33.5; python_version >= '3.9'
 pyasn1==0.6.2
 pyasn1-modules==0.4.2
 pyparsing==3.2.3; python_version >= '3.9'