Update sphinx requirement from <7,>=2.2 to >=2.2,<9 #879

Job	Run time
cwl-utils release test	6m 1s
CI linters via Tox (lint-readme)	26s
CI tests via Tox (3, 8, lint)	21s
CI tests via Tox (3, 8, unit)	2m 32s
CI linters via Tox (pydocstyle)	22s
CI tests via Tox (3, 8, bandit)	32s
CI tests via Tox (3, 8, mypy)	39s
CI tests via Tox (3, 9, lint)	23s
CI tests via Tox (3, 9, unit)	2m 31s
CI tests via Tox (3, 9, bandit)	28s
CI tests via Tox (3, 9, mypy)	44s
CI tests via Tox (3, 10, lint)	20s
CI tests via Tox (3, 10, unit)	2m 32s
CI tests via Tox (3, 10, bandit)	26s
CI tests via Tox (3, 10, mypy)	35s
CI tests via Tox (3, 11, lint)	19s
CI tests via Tox (3, 11, unit)	2m 4s
CI tests via Tox (3, 11, bandit)	24s
CI tests via Tox (3, 11, mypy)	33s
CI tests via Tox (3, 12, lint)	21s
CI tests via Tox (3, 12, unit)	2m 36s
CI tests via Tox (3, 12, bandit)	28s
CI tests via Tox (3, 12, mypy)	39s
	26m 16s

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