chore(deps): bump protobuf in /plugins/model/tts-cosevoice (#5046)

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 4.25 to 4.25.8.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v4.25.0...v4.25.8)

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

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

plugins/model/tts-cosevoice/requirements.txt

@@ -18,7 +18,7 @@ omegaconf==2.3.0
 onnxruntime-gpu; sys_platform == 'linux'
 onnxruntime; sys_platform == 'darwin' or sys_platform == 'windows'
 openai-whisper==20231117
-protobuf==4.25
+protobuf==4.25.8
 pydantic==2.7.0
 rich==13.7.1
 soundfile==0.12.1