Bump protobuf from 4.25.3 to 4.25.8 in /Oracle-23ai-RAG-Chatbot

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 4.25.3 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@v4.25.3...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]

Oracle-23ai-RAG-Chatbot/requirements.txt

@@ -163,7 +163,7 @@ pillow==10.2.0
 platformdirs==4.2.0
 prometheus_client==0.20.0
 prompt-toolkit==3.0.43
-protobuf==4.25.3
+protobuf==4.25.8
 psutil==5.9.8
 ptyprocess==0.7.0
 pure-eval==0.2.2