Make it work on recent Python #1

Job	Run time
check_commit	5s
ci-tests (Py3.8 with old Astropy version, ubuntu-latest, 3.8, py38-test-oldestdeps-cov, false)	37s
ci-tests (Linux, Py3.10 with coverage, ubuntu-latest, 3.10, py310-test-cov, false)	49s
ci-tests (Windows, Py3.11 with coverage, windows-latest, 3.11, py311-test-cov, false)	1m 41s
ci-tests (Mac OS M1, Py3.11, macos-14, 3.11, py311-test, false)	43s
ci-tests (Mac OS, Py3.11, macos-latest, 3.11, py311-test, false)	49s
ci-tests (Linux, Py3.11 all dependencies and coverage, ubuntu-latest, 3.11, py311-test-alldeps-co...	38s
ci-tests (Linux, Py3.12 basic dependencies and coverage, ubuntu-latest, 3.12, py312-test-cov, tru...	48s
ci-tests (Linux, Py3.11 with dev versions of dependencies, ubuntu-latest, 3.11, py311-test-devdep...	1m 20s
	7m 30s

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