Move mypy file definitions to pyproject.toml #3367

Job	Run time
build (3.10, highest, ubuntu-latest)	1m 15s
build (3.10, highest, windows-latest)	3m 9s
build (3.10, lowest-direct, ubuntu-latest)	1m 12s
build (3.10, lowest-direct, windows-latest)	3m 11s
build (3.11, highest, ubuntu-latest)	1m 14s
build (3.11, highest, windows-latest)	3m 5s
build (3.11, lowest-direct, ubuntu-latest)	1m 8s
build (3.11, lowest-direct, windows-latest)	3m 12s
build (3.12, highest, ubuntu-latest)	1m 15s
build (3.12, highest, windows-latest)	3m 20s
build (3.12, lowest-direct, ubuntu-latest)	1m 16s
build (3.12, lowest-direct, windows-latest)	3m 25s
build (3.13, highest, ubuntu-latest)	1m 27s
build (3.13, highest, windows-latest)	3m 26s
build (3.13, lowest-direct, ubuntu-latest)	1m 35s
build (3.13, lowest-direct, windows-latest)	4m 10s
	37m 20s

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