Bump sphinx from 4.0.2 to 4.0.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.0.2 to 4.0.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/4.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v4.0.2...v4.0.3)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -1,5 +1,5 @@
 ipython==7.25.0
-Sphinx==4.0.2
+Sphinx==4.0.3
 sphinxcontrib-fulltoc==1.2.0
 nbsphinx==0.8.6