tests

pyproject: drop support python3.7 #23

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Run time

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Job	Run time
test (ubuntu-latest, 3.8)	43s
test (ubuntu-latest, 3.9)	39s
test (ubuntu-latest, 3.10)	41s
test (ubuntu-latest, 3.11)	42s
test (windows-latest, 3.8)	1m 53s
test (windows-latest, 3.9)	1m 25s
test (windows-latest, 3.10)	1m 50s
test (windows-latest, 3.11)	1m 55s
test (macos-latest, 3.8)	1m 2s
test (macos-latest, 3.9)	39s
test (macos-latest, 3.10)	37s
test (macos-latest, 3.11)	33s
	12m 39s