GitHub Actions: add 3.12, pin NumPy, cleanup (#125) #85

Job	Run time
build_test_dist (3.7, ubuntu-latest)	16s
build_test_dist (3.7, windows-latest)	1m 29s
build_test_dist (3.7, macos-latest)	35s
build_test_dist (3.8, ubuntu-latest)	17s
build_test_dist (3.8, windows-latest)	1m 44s
build_test_dist (3.8, macos-latest)	28s
build_test_dist (3.9, ubuntu-latest)	17s
build_test_dist (3.9, windows-latest)	1m 9s
build_test_dist (3.9, macos-latest)	24s
build_test_dist (3.10, ubuntu-latest)	19s
build_test_dist (3.10, windows-latest)	1m 25s
build_test_dist (3.10, macos-latest)	29s
build_test_dist (3.11, ubuntu-latest)	17s
build_test_dist (3.11, windows-latest)	1m 11s
build_test_dist (3.11, macos-latest)	32s
build_test_dist (3.12, ubuntu-latest)	32s
build_test_dist (3.12, windows-latest)	2m 3s
build_test_dist (3.12, macos-latest)	31s
build_test_wheels (windows-latest, 3.12)	13m 42s
build_test_wheels (ubuntu-latest, 3.12)	2m 52s
build_test_wheels (macos-latest, 3.12)	5m 57s
build_test_wheels (ubuntu-20.04, 3.12, aarch64)	18m 26s
upload_to_pypi	1s
	54m 56s

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