- Update to 6.1.1:
* Let fitsdiff compare files with lower case HIERARCH keywords
* Fix writing a ``HDUList`` to file when numpy 2 is installed and at least
some of the data is represented as dask arrays.
* Fix display of diff reports with numpy 2.
* Ensure that also zero-length tables preserve whether integer data are
signed or unsigned.
* Fix YAML table serialization compatibility with numpy 2.
* Fix bugs in io.votable related to numpy 2's representation of scalars.
* Ensure that return types from ``sigma_clip`` ``cenfunc`` and ``stdfunc``
are np.float64 for scalar values.
* Ensure structured ``MaskedColumn`` are serialized correctly, including
the mask.
* Fix problems converting Pandas Series to ``Table`` with numpy >=2.0.
* Ensure Time in ymdhms format can also be serialized to files as part of a
table if it is masked.
* Ensure Masked versions of ``np.recarray`` will show the correct class
name of ``MaskedRecarray`` in their ``repr``, and that they will be
serialized correctly if part of a table.
* Fix bugs with how masked structured arrays were represented with numpy 2.
* ``MaskedQuantity`` now works properly with ``np.block``.
* Fix a bug where ``WCSAxes`` could be missing negative signs on axis
labels when using matplotlib's ``usetex`` mode.
* Fix compilation with gcc 14, avoid implicit pointer conversions.
- Drop patch 16450.patch, included upstream.
- Remove upper bound on pytest, no longer required.