[Bot] Update inference types

[HuggingFaceInfra]

This PR updates the inference types. It has been generated by running:

# Generate Python code
pnpm run inference-codegen  # from @huggingface/tasks-gen

# Copy to this repository
cp -r ./huggingface.js/packages/tasks/.python_generated/* ./huggingface_hub/src/huggingface_hub/inference/_generated/types

# Clean things
make inference_update
make style

This PR was automatically created by the Update Inference Types workflow.

Make sure the changes are correct before merging.

---

Note

Low Risk
Low risk auto-generated type-hint/docstring updates with no behavioral logic changes; main risk is minor typing/compatibility fallout in downstream users relying on exact annotations.

Overview
Auto-generated inference type refresh. Updates InferenceClient/AsyncInferenceClient method signatures and the _generated/types dataclasses to consistently use Optional[...]/Union[...] instead of T | None/inline unions, alongside required typing imports.

Also tweaks task docstrings (fixes a few malformed/duplicated param docs and clarifies wording for some parameters like seed/num_inference_steps).

^{Reviewed by Cursor Bugbot for commit b058a04. Bugbot is set up for automated code reviews on this repo. Configure here.}

[bot-ci-comment]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.