Bump the all-docs-deps group across 1 directory with 3 updates

Bumps the all-docs-deps group with 3 updates in the /website directory: [pydata-sphinx-theme](https://github.com/pydata/pydata-sphinx-theme), [sphinx-argparse](https://github.com/sphinx-doc/sphinx-argparse) and [sphinx-autoapi](https://github.com/readthedocs/sphinx-autoapi).


Updates `pydata-sphinx-theme` from 0.20.0 to 0.21.0
- [Release notes](https://github.com/pydata/pydata-sphinx-theme/releases)
- [Changelog](https://github.com/pydata/pydata-sphinx-theme/blob/main/RELEASE.md)
- [Commits](pydata/pydata-sphinx-theme@v0.20.0...v0.21.0)

Updates `sphinx-argparse` from 0.6.0 to 0.6.1
- [Release notes](https://github.com/sphinx-doc/sphinx-argparse/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx-argparse/blob/main/docs/changelog.rst)
- [Commits](sphinx-doc/sphinx-argparse@v0.6.0...v0.6.1)

Updates `sphinx-autoapi` from 3.8.0 to 3.8.1
- [Release notes](https://github.com/readthedocs/sphinx-autoapi/releases)
- [Changelog](https://github.com/readthedocs/sphinx-autoapi/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/sphinx-autoapi@v3.8.0...v3.8.1)

---
updated-dependencies:
- dependency-name: pydata-sphinx-theme
  dependency-version: 0.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all-docs-deps
- dependency-name: sphinx-argparse
  dependency-version: 0.6.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all-docs-deps
- dependency-name: sphinx-autoapi
  dependency-version: 3.8.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all-docs-deps
...

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

Author: dependabot[bot]

website/requirements-docs.txt

@@ -1,10 +1,10 @@
 myst_parser==5.1.0
-pydata-sphinx-theme==0.20.0
+pydata-sphinx-theme==0.21.0
 rst2pdf==0.105
 setuptools_scm==10.2.1
 sphinx==9.1.0
-sphinx-argparse==0.6.0
-sphinx-autoapi==3.8.0
+sphinx-argparse==0.6.1
+sphinx-autoapi==3.8.1
 sphinx_copybutton==0.5.2
 sphinx_design==0.7.0
 sphinx_togglebutton==0.4.5