gnu: python-asdf: Update to 2.13.0.
* gnu/packages/astronomy.scm (python-asdf): Update to 2.13.0.
[build-system]: Use pyproject-build-system.
[native-inputs]: Add python-astropy, python-psutil, python-pytest,
python-pytest-doctestplus, python-pytest-openfiles, python-pytest-remotedata,
python-semantic-version.
[propagated-inputs]: Add python-asdf-standard, python-asdf-transform-schemas,
python-asdf-unit-schemas python-importlib-metadata, python-jsonschema-next,
python-lz4. Remove python-jsonschema.
Signed-off-by: Christopher Baines <mail@cbaines.net>
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