chore(deps): update dependency sphinx-autodoc-typehints to v3.13.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sphinx-autodoc-typehints (changelog)	==3.13.8 → ==3.13.9

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Release Notes

tox-dev/sphinx-autodoc-typehints (sphinx-autodoc-typehints)

v3.13.9

Compare Source

Fix the forward-reference warning when documenting NumPy's clip by resolving generic parameters declared in stub signatures. See #​780, which fixes #​779.

Full changelog.

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[claude]

LGTM, trivial dev-dependency version bump. What was reviewed: the single-line change in requirements-dev.txt bumping sphinx-autodoc-typehints from 3.13.8 to 3.13.9 (a Sphinx docs-generation dev dependency) — confirmed no other files changed and the diff is exactly a patch-version bump with no source or behavior impact.

Extended reasoning...

The change touches only requirements-dev.txt, bumping the pinned version of sphinx-autodoc-typehints (a transitive dev-only dependency used for building documentation) from 3.13.8 to 3.13.9, a patch release per its changelog that only fixes a Sphinx forward-reference warning. No source code, tests, or runtime behavior is affected, and there is no security-sensitive surface (no auth, crypto, or data handling). The change is mechanical, self-contained, and low risk, matching the criteria for approval without requiring human review.