Update sphinx-autoapi requirement from ^2.0.1 to ^3.2.1 (#239)

Updates the requirements on [sphinx-autoapi](https://github.com/readthedocs/sphinx-autoapi) to permit the latest version.
- [Release notes](https://github.com/readthedocs/sphinx-autoapi/releases)
- [Changelog](https://github.com/readthedocs/sphinx-autoapi/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/readthedocs/sphinx-autoapi/compare/v2.0.1...v3.2.1)

---
updated-dependencies:
- dependency-name: sphinx-autoapi
  dependency-type: direct:development
...

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pyproject.toml

@@ -41,7 +41,7 @@ pytest-asyncio = "^0.23.8"
 pytest-cov = "^4.1.0"
 ruff = "^0.3.0"
 Sphinx = "^7.1.2"
-sphinx-autoapi = "^2.0.1"
+sphinx-autoapi = "^3.2.1"
 sphinx-autodoc-typehints = "^1.24.0"
 sphinxcontrib-spelling = "^8.0.0"
 sphinx-copybutton = "^0.5.2"