Bump mypy from 1.8.0 to 1.9.0 #272

Job	Run time
upgrade & test conformance tests	3m 10s
cwl-utils release test	1m 45s
CI tests via Tox (3, 8, lint)	16s
CI linters via Tox (lintreadme)	34s
CI tests via Tox (3, 8, unit)	26s
CI linters via Tox (pydocstyle)	27s
CI tests via Tox (3, 8, mypy)	26s
CI tests via Tox (3, 9, lint)	17s
CI tests via Tox (3, 9, unit)	27s
CI tests via Tox (3, 9, mypy)	27s
CI tests via Tox (3, 10, lint)	13s
CI tests via Tox (3, 10, unit)	26s
CI tests via Tox (3, 10, mypy)	27s
CI tests via Tox (3, 11, lint)	13s
CI tests via Tox (3, 11, unit)	22s
CI tests via Tox (3, 11, mypy)	26s
CI tests via Tox (3, 12, lint)	13s
CI tests via Tox (3, 12, unit)	27s
CI tests via Tox (3, 12, mypy)	27s
	11m 29s

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