chore(deps): update sphinx-autoapi requirement from <4,>=3 to >=3.6.1,<4

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](readthedocs/sphinx-autoapi@v3.0.0...v3.6.1)

---
updated-dependencies:
- dependency-name: sphinx-autoapi
  dependency-version: 3.6.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,4 +1,4 @@
 m2r2>=0.3.2
 sphinx>=8,<9
-sphinx-autoapi>=3,<4
+sphinx-autoapi>=3.6.1,<4
 sphinx-rtd-theme>=3,<4