chore(deps): bump the pip group

Bumps the pip group in /backend/python/transformers with 2 updates: [torch](https://github.com/pytorch/pytorch) and [protobuf](https://github.com/protocolbuffers/protobuf).


Updates `torch` from 2.3.1+cxx11.abi to 2.7.1
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/main/RELEASE.md)
- [Commits](https://github.com/pytorch/pytorch/commits/v2.7.1)

Updates `protobuf` from 6.31.0 to 6.31.1
- [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/v6.31.0...v6.31.1)

---
updated-dependencies:
- dependency-name: torch
  dependency-version: 2.7.1
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: protobuf
  dependency-version: 6.31.1
  dependency-type: direct:production
  dependency-group: pip
...

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

backend/python/transformers/requirements-cpu.txt

@@ -1,4 +1,4 @@
-torch==2.4.1
+torch==2.7.1
 llvmlite==0.43.0
 numba==0.60.0
 accelerate
@@ -6,4 +6,4 @@ transformers
 bitsandbytes
 outetts
 sentence-transformers==3.4.1
-protobuf==6.31.0
+protobuf==6.31.1