Ligo.skymap

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- Track an API change in Matplotlib 3.7.0. Update test baseline images.

- Update Linux wheels from manylinux2014 to manylinux_2_28.

- Require scipy ≠ 1.10.0 due to an unplanned API change in that version, which
was fixed in 1.10.1.

- Add unit tests under Python 3.11 to the continuous integration pipeline.

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- Fix an issue with OpenMP and Python multiprocessing that caused
``ligo-skymap-stats`` to parallelize inefficiently on Linux.

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- Require scipy < 1.10.0 due to removal of ``multivariate_normal_gen.cov`` in
that version. A future version of Scipy may add it back as a property; see
`scipy/scipy17896`__.

__ https://github.com/scipy/scipy/issues/17896

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- Change the default value of the ``origin`` card in FITS files generated by
BAYESTAR and ``ligo-skymap-from-samples`` from ``LIGO/Virgo`` to
``LIGO/Virgo/KAGRA``.

- Build binary wheels for the aarch64 (Arm64) architecture on Linux.

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- Update condor accounting group in ``bayestar-localize-coincs`` and
``bayestar-mcmc`` to ``ligo.dev.o4.cbc.pe.bayestar``.

- Track `pending deprecation of matplotlib.cm.register_cmap`__.
Require matplotlib >= 3.5.0.

__ https://matplotlib.org/stable/api/prev_api_changes/api_changes_3.6.0.html#pending-deprecation-top-level-cmap-registration-and-access-functions-in-mpl-cm

- The function ``ligo.skymap.postprocess.ellipse.find_ellipse`` will now return
a tuple of the same length in all circumstances, even under error conditions.

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- Add fast path for PowerPC and other architectures in ``uniq2order``.