updates for upcoming ASDF standard 1.6.0 #952

Job	Run time
sdist_verify	17s
allowed-fail-tests / Load tox environments	7s
docs / Load tox environments	4s
tests / Load tox environments	9s
docs / build_docs-notebooks (ubuntu-latest)	4m 42s
allowed-fail-tests / py311-devdeps (ubuntu-latest)	1m 54s
tests / py312 (ubuntu-latest)	6m 7s
tests / py311 (ubuntu-latest)	3m 42s
tests / py311-online (windows-latest)	6m 3s
tests / py310 (macos-latest)	7m 11s
tests / py310-oldestdeps (ubuntu-latest)	3m 29s
publish	0s
notify	0s
	33m 45s

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