bump singularity testing version #652

Job	Run time
CI linters via Tox (lint-readme)	31s
CI linters via Tox (pydocstyle)	18s
cwl-utils release test	4m 35s
CI tests via Tox (3, 8, lint)	37s
CI tests via Tox (3, 8, unit)	2m 40s
CI tests via Tox (3, 8, bandit)	43s
CI tests via Tox (3, 8, mypy)	52s
CI tests via Tox (3, 9, lint)	38s
CI tests via Tox (3, 9, unit)	2m 17s
CI tests via Tox (3, 9, bandit)	43s
CI tests via Tox (3, 9, mypy)	1m 18s
CI tests via Tox (3, 10, lint)	38s
CI tests via Tox (3, 10, unit)	2m 42s
CI tests via Tox (3, 10, bandit)	45s
CI tests via Tox (3, 10, mypy)	59s
CI tests via Tox (3, 11, lint)	30s
CI tests via Tox (3, 11, unit)	2m 31s
CI tests via Tox (3, 11, bandit)	33s
CI tests via Tox (3, 11, mypy)	1m 1s
CI tests via Tox (3, 12, lint)	40s
CI tests via Tox (3, 12, unit)	2m 39s
CI tests via Tox (3, 12, bandit)	43s
CI tests via Tox (3, 12, mypy)	1m 3s
	29m 56s

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