Bump sphinx-autoapi from 3.2.0 to 3.2.1 in /doc

Bumps [sphinx-autoapi](https://github.com/readthedocs/sphinx-autoapi) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/readthedocs/sphinx-autoapi/releases)
- [Changelog](https://github.com/readthedocs/sphinx-autoapi/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/sphinx-autoapi@v3.2.0...v3.2.1)

---
updated-dependencies:
- dependency-name: sphinx-autoapi
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

doc/requirements.txt

@@ -1,5 +1,5 @@
 Sphinx==7.4.7
-sphinx-autoapi===3.2.0
+sphinx-autoapi===3.2.1
 sphinx_rtd_theme==2.0.0
 sphinxcontrib-napoleon==0.7
 sphinx-copybutton==0.5.2