Bump sphinx from 5.3.0 to 7.0.1 (#596)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.3.0 to 7.0.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v5.3.0...v7.0.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Samuel Tovey <[email protected]>

Author: dependabot[bot]

dev-requirements.txt

@@ -2,7 +2,7 @@ sphinxcontrib.bibtex
 pybtex
 pytest
 nbsphinx
-Sphinx==5.3.0
+Sphinx==7.0.1
 sphinx_rtd_theme
 numpydoc
 docutils==0.19