Asdf-astropy

------------------

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

------------------

- 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]

------------------

- 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]

------------------

- Update pins for ``asdf``, ``asdf-coordinates-schemas``, ``numpy``, and ``packaging``. [164]
- Add serialization support for non-VOunits. [142]
- Add serialization support for ``MagUnit`` based units. [146]
- Document and add ``assert_model_roundtrip`` and ``assert_table_roundtrip`` to
``asdf_astropy.testing.helpers``. [170]

------------------

- Update citations. [111]
- Switch to using ``pyproject.toml`` for package configuration. [106]
- Fix bug with ``memmap`` of ``Quantity`` objects. [125]
- Drop support for ``numpy-1.18``. [116]
- Fix bug with ``str`` representations of ``astropy.time`` objects. [132]
- Fix bug in preserving the ``dtype`` of ``Quantity`` objects. [131]

------------------

- Add converter for the new ``Schechter1D`` model. [67]
- Add CITATION file. [71]
- Add migration and quick-start documentation guides, and update minimum Python version [77]
- Update ``FrameConverter`` to enable the use of multiple tags. [81]
- Bugfixes for ``astropy.time`` converters. [86]
- Remove unnecessary ``tag:`` from schemas. [103]
- Add converters for ``ModelBoundingBox`` and ``CompoundBoundingBox``. [69]