Update black requirement to allow newer versions #914

Job	Run time
cwl-utils release test	4m 33s
CI tests via Tox (3, 9, lint)	17s
CI linters via Tox (lint-readme)	18s
CI tests via Tox (3, 9, unit)	2m 9s
CI tests via Tox (3, 9, bandit)	22s
CI linters via Tox (pydocstyle)	14s
CI tests via Tox (3, 9, mypy)	45s
CI tests via Tox (3, 10, lint)	19s
CI tests via Tox (3, 10, unit)	1m 57s
CI tests via Tox (3, 10, bandit)	29s
CI tests via Tox (3, 10, mypy)	1m 3s
CI tests via Tox (3, 11, lint)	20s
CI tests via Tox (3, 11, unit)	2m 12s
CI tests via Tox (3, 11, bandit)	21s
CI tests via Tox (3, 11, mypy)	59s
CI tests via Tox (3, 12, lint)	19s
CI tests via Tox (3, 12, unit)	2m 30s
CI tests via Tox (3, 12, bandit)	23s
CI tests via Tox (3, 12, mypy)	51s
CI tests via Tox (3, 13, lint)	29s
CI tests via Tox (3, 13, unit)	2m 17s
CI tests via Tox (3, 13, bandit)	28s
CI tests via Tox (3, 13, mypy)	1m 33s
	25m 8s

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