add Python 3.13 #216

Job	Run time
crds_contexts / retrieve latest CRDS contexts	4s
crds_test_cache / contexts / retrieve latest CRDS contexts	5s
build / date	1s
build / build (Python 3.10, ubuntu-latest)	1m 28s
build / build (Python 3.11, ubuntu-latest)	1m 27s
build / build (Python 3.12, ubuntu-latest)	1m 29s
build / build (Python 3.13, ubuntu-latest)	27s
build / build (Python 3.10, macos-13)	1m 38s
build / build (Python 3.11, macos-13)	1m 39s
build / build (Python 3.12, macos-13)	1m 39s
build / build (Python 3.13, macos-13)	1m 24s
build / build (Python 3.10, macos-latest)	1m 38s
build / build (Python 3.11, macos-latest)	1s
build / build (Python 3.12, macos-latest)	1s
build / build (Python 3.13, macos-latest)	1s
crds_test_cache / download and cache CRDS test files	1m 30s
`${{ matrix.run }}` (${{ matrix.runs-on }}, py${{ matrix.python-version }})	1s
`pytest ${{ matrix.package }}/${{ matrix.test-directory }} ${{ matrix.pytest-args }} -n auto --dist=loadscope` (${{ matrix.runs-on }}, py${{ matrix.python-version }})	1s
`crds` `./runtests --cover` (${{ matrix.runs-on }}, py${{ matrix.python-version }})	1s
`pytest --pyargs ${{ matrix.package }} ${{ matrix.pytest-args }} -n auto --dist=loadscope` (${{ matrix.runs-on }}, py${{ matrix.python-version }})	1s
	14m 36s

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