build(deps): bump protobuf from 4.25.5 to 4.25.8 in /requirements/extras (#5209)

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 4.25.5 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@v4.25.5...v4.25.8)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: parknate@ <[email protected]>

Author: dependabot[bot]

requirements/extras/test_requirements.txt

@@ -32,7 +32,7 @@ PyYAML>=6.0.1
 xgboost>=1.6.2,<=1.7.6
 pillow>=10.0.1,<=11
 opentelemetry-proto==1.27.0
-protobuf==4.25.5
+protobuf==4.25.8
 tensorboard>=2.16.2,<=2.18.0
 transformers==4.48.0
 sentencepiece==0.1.99