Run Mypy by default. #2582

Job	Run time
link_check	3m 20s
check_release	1m 38s
build (ubuntu-latest, 3.8)	4m 52s
build (ubuntu-latest, 3.12)	3m 26s
Make SDist	28s
test_docs	35s
build (windows-latest, 3.8)	8m 54s
build (windows-latest, 3.12)	7m 42s
Test Lint	53s
Test Minimum Versions	4m 32s
build (macos-latest, 3.8)	5m 12s
build (macos-latest, 3.12)	3m 14s
Test Prereleases	2m 5s
build (windows-latest, 3.9)	8m 55s
test_without_debugpy (ubuntu-latest, 3.9)	1m 58s
build (ubuntu-latest, pypy-3.9)	3m 6s
build (macos-latest, 3.10)	2m 53s
build (ubuntu-latest, 3.11)	3m 11s
Install from SDist and Test	1m 53s
coverage	0s
tests_check	7s
	1h 8m 54s

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