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Update mypy to 2.4.0 #16286

Job	Run time
stubtest: stdlib (ubuntu-latest, 3.11)	33s
stubtest: stdlib (macos-latest, 3.13)	56s
stubtest: stdlib (ubuntu-latest, 3.15)	25s
stubtest: stdlib (macos-latest, 3.10)	1m 12s
stubtest: stdlib (windows-latest, 3.14)	1m 23s
stubtest: stdlib (macos-latest, 3.12)	41s
stubtest: stdlib (windows-latest, 3.12)	1m 7s
stubtest: stdlib (ubuntu-latest, 3.14)	35s
stubtest: stdlib (windows-latest, 3.11)	1m 18s
stubtest: stdlib (macos-latest, 3.14)	1m 13s
stubtest: stdlib (ubuntu-latest, 3.12)	38s
stubtest: stdlib (ubuntu-latest, 3.13)	28s
stubtest: stdlib (windows-latest, 3.13)	1m 40s
stubtest: stdlib (windows-latest, 3.15)	1m 35s
stubtest: stdlib (ubuntu-latest, 3.10)	42s
stubtest: stdlib (macos-latest, 3.11)	39s
stubtest: stdlib (macos-latest, 3.15)	1m 10s
	16m 15s