Update mypy requirement from ==1.12.* to >=1.12,<1.14 #5875

Job	Run time
test_cygwin (39, windows-latest)	15m 24s
collateral (diffcov)	5m 44s
collateral (docs)	2m 14s
test (3.9, ubuntu-latest)	4m 22s
test (3.9, macos-latest)	3m 34s
test (3.9, windows-latest)	8m 43s
test (3.13, ubuntu-latest)	5m 17s
test (3.13, macos-latest)	5m 39s
test (3.13, windows-latest)	8m 44s
test (3.10, ubuntu-latest)	4m 27s
test (3.11, ubuntu-latest)	4m 0s
test (3.12, ubuntu-latest)	5m 31s
test (3.14, ubuntu-latest)	6m 51s
test (pypy3.10, ubuntu-latest, stdlib)	8m 38s
test (ubuntu-latest, 3.10, stdlib)	4m 20s
integration-test	0s
check	3s
release	0s
	1h 33m 31s

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