chore(deps): bump the pip group across 3 directories with 2 updates

Bumps the pip group with 2 updates in the /backend/python/chatterbox directory: torch and [transformers](https://github.com/huggingface/transformers).
Bumps the pip group with 1 update in the /backend/python/faster-whisper directory: torch.
Bumps the pip group with 1 update in the /backend/python/kokoro directory: torch.


Updates `torch` from 2.3.1+cxx11.abi to 2.6.0+cu118

Updates `transformers` from 4.46.3 to 4.50.0
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](https://github.com/huggingface/transformers/compare/v4.46.3...v4.50.0)

Updates `torch` from 2.3.1+cxx11.abi to 2.6.0+cu118

Updates `torch` from 2.3.1+cxx11.abi to 2.6.0+cu118

---
updated-dependencies:
- dependency-name: torch
  dependency-version: 2.6.0+cu118
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: transformers
  dependency-version: 4.50.0
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: torch
  dependency-version: 2.6.0+cu118
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: torch
  dependency-version: 2.6.0+cu118
  dependency-type: direct:production
  dependency-group: pip
...

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

backend/python/chatterbox/requirements-cpu.txt

@@ -1,5 +1,5 @@
 accelerate
-torch==2.6.0
+torch==2.6.0+cu118
 torchaudio==2.6.0
-transformers==4.46.3
+transformers==4.50.0
 chatterbox-tts