CI

Admin: Remove Py 3.7 support #152

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Run time

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Job	Run time
mypy (3.8)	20s
mypy (3.9)	20s
Python 3.8	26s
mypy (3.10)	20s
Python pypy3.8	1m 9s
mypy (3.11)	19s
Python 3.9	29s
mypy (3.12)	18s
Python pypy3.9	1m 17s
Python 3.10	31s
Python pypy3.10	2m 58s
Python 3.11	28s
Python 3.12	1m 10s
	10m 5s