reduce frequency of pre-commit.ci autoupdate PRs (#15798) #10693

Job	Run time
Test mypyc suite with 32-bit Python	12m 40s
Test suite with py38-ubuntu, mypyc-compiled	24m 29s
Test suite with py38-windows-64	37m 2s
Test suite with py39-ubuntu	28m 54s
Test suite with py310-ubuntu	24m 0s
Test suite with py311-ubuntu, mypyc-compiled	25m 7s
Test suite with py312-ubuntu, mypyc-compiled	22m 45s
mypyc runtime tests with py38-macos	9m 27s
mypyc runtime tests with py38-debug-build-ubuntu	7m 9s
Type check our own code (py38-ubuntu)	2m 17s
Type check our own code (py38-windows-64)	3m 34s
Formatting and code style with Black + ruff	53s
	3h 18m 17s

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