updates for upcoming ASDF standard 1.6.0 #911

Job	Run time
sdist_verify	21s
allowed-fail-tests / Load tox environments	6s
tests / Load tox environments	14s
docs / Load tox environments	10s
allowed-fail-tests / py311-devdeps (ubuntu-latest)	3m 6s
docs / build_docs-notebooks (ubuntu-latest)	11m 27s
tests / py312 (ubuntu-latest)	2m 7s
tests / py311 (ubuntu-latest)	2m 1s
tests / py311-online (windows-latest)	2m 42s
tests / py310 (macos-latest)	2m 0s
tests / py310-oldestdeps (ubuntu-latest)	3m 59s
publish	0s
notify	0s
	28m 13s

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