Asdf-astropy

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- drop support for python 3.10 and numpy 1.24. [255]

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- register blank ASDF extensions to prevent warnings for
ASDF files generated with asdf-astropy 0.5.0. [258]

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- strip None factor for spectral_density in equivalency converter
to avoid deprecation warnings for astropy 7. [229]

- drop support for python 3.9. [232]

- replace usages of ``copy_arrays`` with ``memmap`` [230]

- require asdf 2.14.4 [241]

- Add support for astropy.nddata.uncertainty classes [239]

- Add support for astropy.wcs.WCS and astropy.wcs.wcsapi.SlicedLowLevelWCS [246]

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- update ``copy`` usage in ``Quantity`` converter to
deal with astropy 6.1 changes. [224]

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- Add python 3.12 support. [219]
- Update ASDF standard 1.6.0 support. [219]
- Increase minimum versions for ``asdf-coordinates-schemas``
``asdf-transform-schemas`` and list ``asdf-standard`` as
a dependency. [219]

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- Drop support for Python 3.8 in accordance with NEP 29. [180]
- Update ``RepresentationConverter`` for new class paths in astropy [181]
- Update Converters so that all Class Variables are immutable [188]
- Remove ``oldest-supported-numpy`` from ``pyproject.toml`` ``build-system``
as this was never needed and will cause problems building on python 3.12 betas. [193]
- Use unique uri for extensions that implement converters for core asdf types [199]
- Add support for astropy.table.NdarrayMixin [200]
- Update angle converters for new class paths in astropy [207]