Run mypy_primer

Update to Python 3.15b3 #22803

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Job	Run time
Run (5)	4m 12s
Run (0)	4m 26s
Run (2)	5m 50s
Run (3)	4m 38s
Run (1)	4m 6s
Run (4)	5m 34s
Join artifacts	7s
	28m 53s