CI

Fixed package discovery #56

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Run time

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Job	Run time
macOS (3.7)	55s
Windows (3.7)	54s
macOS (3.8)	26s
Ubuntu (3.7)	23s
Windows (3.8)	46s
macOS (3.9)	27s
Ubuntu (3.8)	14s
Windows (3.9)	44s
macOS (3.10)	27s
Ubuntu (3.9)	18s
Windows (3.10)	55s
macOS (3.11)	28s
Ubuntu (3.10)	21s
Windows (3.11)	53s
macOS (3.12)	28s
Ubuntu (3.11)	18s
Windows (3.12)	1m 3s
Ubuntu (3.12-dev)	29s
Ubuntu (3.10, check formatting)	14s
	10m 43s