Bump sphinx from 5.2.3 to 5.3.0 in /docs

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.2.3 to 5.3.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v5.2.3...v5.3.0)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -2,5 +2,5 @@ archspec==0.1.4
 docutils==0.17.1 # https://github.com/sphinx-doc/sphinx/issues/9001
 jsonschema==3.2.0
 semver==2.13.0
-Sphinx==5.2.3
+Sphinx==5.3.0
 sphinx-rtd-theme==1.0.0