revert to schema-salad 8.4.20230817074451 to fix format field handling #712

Job	Run time
cwl-utils release test	1m 58s
CI linters via Tox (lint-readme)	28s
CI tests via Tox (3, 8, lint)	25s
CI linters via Tox (pydocstyle)	21s
CI tests via Tox (3, 8, unit)	52s
CI tests via Tox (3, 8, bandit)	41s
CI tests via Tox (3, 8, mypy)	50s
CI tests via Tox (3, 9, lint)	27s
CI tests via Tox (3, 9, unit)	6s
CI tests via Tox (3, 9, bandit)	42s
CI tests via Tox (3, 9, mypy)	48s
CI tests via Tox (3, 10, lint)	37s
CI tests via Tox (3, 10, unit)	52s
CI tests via Tox (3, 10, bandit)	24s
CI tests via Tox (3, 10, mypy)	34s
CI tests via Tox (3, 11, lint)	25s
CI tests via Tox (3, 11, unit)	51s
CI tests via Tox (3, 11, bandit)	39s
CI tests via Tox (3, 11, mypy)	50s
CI tests via Tox (3, 12, lint)	37s
CI tests via Tox (3, 12, unit)	51s
CI tests via Tox (3, 12, bandit)	32s
CI tests via Tox (3, 12, mypy)	49s
	15m 39s

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