py-astropy: updated to 5.3.4

Version 5.3.4 (2023-10-03)
==========================

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.

astropy.io.votable

- Fixed a bug in ``convert_to_writable_filelike`` where ``GzipFile`` was not
  closed properly.

astropy.units

- In VOUnit, the spaces around the slash were removed in the formatting of
  fractions, and fractional powers now also use the "**" operator.

- 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").

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).


(adam)