Update protobuf requirement in /AskAgent/python

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 7.34.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

AskAgent/python/requirements.txt

@@ -6,7 +6,7 @@ jsonschema>=4.19.1
 mcp>=1.0.0
 marshmallow<4.0.0
 packaging>=16.8,<27
-protobuf<5,>=3.20
+protobuf>=3.20,<8
 matplotlib>=3.8.0
 python-dotenv>=1.0.0
 aiohttp>=3.9.1