Bump protobuf from 4.25.1 to 4.25.8 in /demos/common/stream_client (#3414)

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 4.25.1 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@v4.25.1...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>

Author: dependabot[bot]

demos/common/stream_client/requirements.txt

@@ -1,5 +1,5 @@
 tritonclient[grpc]==2.41.0
 ffmpeg-python==0.2.0
 opencv-python==4.9.0.80
-protobuf==4.25.1
+protobuf==4.25.8
 numpy<2.0.0