Log Message:
py-sphinx-astropy: updated to 1.9.1

1.9.1 (2023-06-07)

- Renamed ``[v2]`` optional dependencies key to ``[confv2]``
  to avoid triggering build error in Python 3.10 or earlier.

1.9 (2023-06-06)

- To switch to ``pydata-sphinx-theme``, use ``sphinx_astropy.conf.v2``
  and install the ``[v2]`` optional dependencies.
- Update minimum required version of Sphinx to 3.0.0.
- ``check_sphinx_version`` is deprecated.

1.8 (2023-01-06)

- Update scipy intersphinx URL.
- Ensure that jQuery is always installed with Sphinx 6+.