Update protobuf requirement in the pip group across 1 directory

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.

Updates `protobuf` to 6.31.1
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.19.4...v6.31.1)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 6.31.1
  dependency-type: direct:production
  dependency-group: pip
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 psutil~=7.0.0
 requests~=2.32.4
 grpcio~=1.71.0
-protobuf~=5.29.4
+protobuf~=6.31.1
 docker~=7.1.0
 typing-extensions~=4.13.0
 pydantic~=2.11.1