Bump sphinx from 7.4.3 to 7.4.4

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.4.3 to 7.4.4.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.4.3...v7.4.4)

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

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

aiosmtpd/docs/requirements.txt

@@ -1,6 +1,6 @@
 -r ../../requirements.txt
 
 ### Sphinx deps
-sphinx==7.4.3
+sphinx==7.4.4
 sphinx-autofixture==0.4.0
 sphinx_rtd_theme==2.0.0