Add support for Python 3.14

[albertvillanova]

Add support for Python 3.14, which was first released yesterday:

• First release: 2025-10-07

[HuggingFaceDocBuilderDev]

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[albertvillanova]

Currently, there are some issues with torchvision dependency:

  × No solution found when resolving dependencies:
  ╰─▶ Because vllm==0.10.2 depends on torchvision==0.23.0 and
      torchvision==0.23.0 has no wheels with a matching Python ABI tag (e.g.,
      `cp314`), we can conclude that vllm==0.10.2 cannot be used.
      And because trl[dev]==0.24.0.dev0 depends on vllm==0.10.2, we can
      conclude that trl[dev]==0.24.0.dev0 cannot be used.
      And because only trl[dev]==0.24.0.dev0 is available and you require
      trl[dev], we can conclude that your requirements are unsatisfiable.

      hint: You require CPython 3.14 (`cp314`), but we only found wheels for
      `torchvision` (v0.23.0) with the following Python ABI tags: `cp39`,
      `cp310`, `cp311`, `cp312`, `cp313`, `cp313t`

Check upstream issue on pytorch:

• Python 3.14 support for PyTorch pytorch/pytorch#156856

[albertvillanova]

Related PR:

• Exclude vllm dependencies from dev extra #4229

[qgallouedec]

Ok so we need to wait until python 3.14 is supported then