Sphinx-astropy

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- Renamed ``[v2]`` optional dependencies key to ``[confv2]``
to avoid triggering build error in Python 3.10 or earlier. [63]

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- To switch to ``pydata-sphinx-theme``, use ``sphinx_astropy.conf.v2``
and install the ``[v2]`` optional dependencies. [59]

- Update minimum required version of Sphinx to 3.0.0. [57]

- ``check_sphinx_version`` is deprecated. [57]

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- Update scipy intersphinx URL. [53]

- Ensure that jQuery is always installed with Sphinx 6+. [56]

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- Removed dependency on ``distutils``. As a result, ``packaging`` is now
a dependency. [51]

- Updated ``matplotlib`` URL for intersphinx. [52]

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- Updated minimum required version of ``pytest-doctestplus`` to 0.11. [47]