Bump sphinx from 4.0.2 to 4.5.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.0.2 to 4.5.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/5.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v4.0.2...v4.5.0)

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

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

dev-requirements.txt

@@ -5,7 +5,7 @@ nbsphinx
 nbsphinx-link
 numpydoc
 sphinx-copybutton
-sphinx==4.0.2
+sphinx==4.5.0
 pandoc
 numpy
 matplotlib