Bump numpydoc from 1.5.0 to 1.6.0 in /requirements

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] <[email protected]>

requirements/requirements_doc.txt

@@ -10,7 +10,7 @@ jupyter_sphinx==0.4.0
 jupyterlab>=3.2.8
 matplotlib==3.8.0
 numpy==1.26.0
-numpydoc==1.5.0
+numpydoc==1.6.0
 pandas==2.1.1
 panel==1.2.3
 plotly==5.17.0