chore(deps): bump protobuf from 4.22.3 to 4.25.8 in /tools/python

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 4.22.3 to 4.25.8.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v4.22.3...v4.25.8)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 4.25.8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

tools/python/requirements.txt

@@ -14,7 +14,7 @@ grpcio-status==1.54.0
 httplib2==0.22.0
 idna==3.4
 proto-plus==1.22.2
-protobuf==4.22.3
+protobuf==4.25.8
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pyparsing==3.0.9