Run mypy_primer

Better `tox` configuration #5396

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Run time

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Job	Run time
Run mypy_primer (0)	15m 17s
Run mypy_primer (1)	16m 18s
Run mypy_primer (2)	11m 12s
Run mypy_primer (3)	20m 55s
Run mypy_primer (4)	20m 52s
	1h 24m 34s