Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 8.2.3 to 9.1.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.2.3...v9.1.0)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 9.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Use modulo arithmetic to map job index to secrets file index,
ensuring that adding Python versions to the matrix doesn't break
the secrets file lookup. Each test pattern maps to the same
secrets file regardless of Python version.

The number of secrets files is determined dynamically from
the extracted tarball.

This reverts commit 9a342f4.

Beartype requires imports to be available at runtime, not just under
`if TYPE_CHECKING`. See beartype/beartype#594
for when beartype 0.23 will add support for TYPE_CHECKING imports.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>