Bump sphinx from 5.2.2 to 5.2.3 in /requirements (#128)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.2.2 to 5.2.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/5.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v5.2.2...v5.2.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

requirements/requirements_doc.txt

@@ -1,4 +1,4 @@
-Sphinx==5.2.2
+Sphinx==5.2.3
 numpydoc==1.4.0
 sphinx-copybutton==0.5.0
 sphinx-notfound-page==0.8.3