Bump sphinx from 7.4.7 to 8.0.2 in the pip group

Bumps the pip group with 1 update: [sphinx](https://github.com/sphinx-doc/sphinx).


Updates `sphinx` from 7.4.7 to 8.0.2
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.0.2/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.4.7...v8.0.2)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: pip
...

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

docs/requirements.txt

@@ -1,3 +1,3 @@
 myst-parser==3.0.1
-sphinx==7.4.7
+sphinx==8.0.2
 sphinx-book-theme==1.1.3