- Update to 5.3.4
  ## Bug Fixes
  ### astropy.io.misc
  * Updated ``astropy.io.misc.yaml`` so ``dump()` with a numpy
    object array or ``load()`` with YAML representing a Numpy
    object array both raise ``TypeError``. This prevents problems
    like a segmentation fault. [#15373]
  ### astropy.io.votable
  * Fixed a bug in ``convert_to_writable_filelike`` where
    ``GzipFile`` was not closed properly. [#15359]
  ### astropy.units
  * In VOUnit, the spaces around the slash were removed in the
    formatting of fractions, and fractional powers now also use the
    "**" operator. [#15282]
  * We now ensure that the unit ``u.cgs.cm`` is just an alias of
    ``u.si.cm``, instead of a redefinition.  This ensures that
    ``u.Unit("cm") / u.cm`` will reliably cancel to dimensionless
    (instead of some "cm / cm"). [#15368]
  ### astropy.utils
  * For ``Masked``, ``np.ptp`` and the ``.ptp()`` method now
    properly account for the mask, ensuring the result is identical
    to subtracting the maximum and minimum (with the same
    arguments). [#15380]
  ## Other Changes and Additions
  * Compatibility with Python 3.12. [#14784]
  * Replaced the URL of ``IETF_LEAP_SECOND_URL`` because the
    original is now defunct and IETF now defers to IANA for such
    look-up. [#15421]

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