Bump sphinx from 7.2.6 to 8.0.2

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.2.6 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@v7.2.6...v8.0.2)

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

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

setup.cfg

@@ -62,7 +62,7 @@ console_scripts =
 
 [options.extras_require]
 docs =
-    sphinx==7.2.6
+    sphinx==8.0.2
     sphinx-astropy[confv2]==1.9.1
     sphinx-favicon==1.0.1
     sphinxcontrib-programoutput==0.17
@@ -83,7 +83,7 @@ dev =
     pytest-cov==5.0.0
     pytest-order==1.3.0
     rstcheck==6.2.1
-    sphinx==7.2.6
+    sphinx==8.0.2
     sphinx-astropy[confv2]==1.9.1
     sphinx-favicon==1.0.1
     sphinxcontrib-programoutput==0.17