chore(python): Bump numpydoc from 1.7.0 to 1.8.0 in /py-polars

Bumps [numpydoc](https://github.com/numpy/numpydoc) from 1.7.0 to 1.8.0.
- [Release notes](https://github.com/numpy/numpydoc/releases)
- [Changelog](https://github.com/numpy/numpydoc/blob/main/RELEASE.rst)
- [Commits](numpy/numpydoc@v1.7.0...v1.8.0)

---
updated-dependencies:
- dependency-name: numpydoc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

py-polars/docs/requirements-docs.txt

@@ -7,7 +7,7 @@ sphinx==7.3.7
 
 # Third-party Sphinx extensions
 autodocsumm==0.2.12
-numpydoc==1.7.0
+numpydoc==1.8.0
 pydata-sphinx-theme==0.15.4
 sphinx-autosummary-accessors==2023.4.0
 sphinx-copybutton==0.5.2