Bump actions/setup-python from 5 to 6 #319

Job	Run time
upgrade & test conformance tests	2m 51s
CI linters via Tox (lintreadme)	34s
cwl-upgrader release test	1m 10s
CI tests via Tox (3, 9, lint)	15s
CI linters via Tox (pydocstyle)	26s
CI tests via Tox (3, 12, lint)	17s
CI tests via Tox (3, 10, unit)	28s
CI tests via Tox (3, 10, lint)	22s
CI tests via Tox (3, 11, unit)	31s
CI tests via Tox (3, 11, mypy)	33s
CI tests via Tox (3, 13, unit)	36s
CI tests via Tox (3, 10, mypy)	32s
CI tests via Tox (3, 11, lint)	20s
CI tests via Tox (3, 12, mypy)	27s
CI tests via Tox (3, 9, mypy)	30s
CI tests via Tox (3, 13, lint)	20s
CI tests via Tox (3, 13, mypy)	29s
CI tests via Tox (3, 9, unit)	36s
CI tests via Tox (3, 12, unit)	32s
cwl-upgrader release test	1m 12s
CI tests via Tox (3, 9, unit)	36s
CI linters via Tox (pydocstyle)	26s
CI linters via Tox (lintreadme)	34s
CI tests via Tox (3, 9, lint)	15s
CI tests via Tox (3, 10, lint)	22s
CI tests via Tox (3, 9, mypy)	30s
CI tests via Tox (3, 11, lint)	20s
CI tests via Tox (3, 11, unit)	31s
CI tests via Tox (3, 12, unit)	32s
CI tests via Tox (3, 12, lint)	17s
CI tests via Tox (3, 12, mypy)	27s
CI tests via Tox (3, 13, unit)	36s
CI tests via Tox (3, 13, mypy)	29s
CI tests via Tox (3, 11, mypy)	33s
upgrade & test conformance tests	2m 51s
CI tests via Tox (3, 10, unit)	28s
CI tests via Tox (3, 13, lint)	20s
CI tests via Tox (3, 10, mypy)	32s
	23m 40s

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