fix(deps): bump numpydoc from 1.5.0 to 1.6.0

Bumps [numpydoc](https://github.com/numpy/numpydoc) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/numpy/numpydoc/releases)
- [Changelog](https://github.com/numpy/numpydoc/blob/main/doc/release_notes.rst)
- [Commits](numpy/numpydoc@v1.5.0...v1.6.0)

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

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

Author: dependabot[bot]

requirements-docs.txt

@@ -1,5 +1,5 @@
 matplotlib==3.8.0
-numpydoc==1.5.0
+numpydoc==1.6.0
 sphinx==7.2.5
 sphinx-gallery==0.13.0
 sphinx-rtd-theme==1.3.0