Make asdf standard 1.6.0 stable (default) #2896

Job	Run time
astropy / Load tox environments	7s
asdf / Load tox environments	6s
stsci / Load tox environments	5s
third-party / Load tox environments	6s
stsci / astrocut (ubuntu-latest)	57s
stsci / gwcs (ubuntu-latest)	1m 8s
stsci / jwst (ubuntu-latest)	30m 46s
stsci / stdatamodels (ubuntu-latest)	6m 24s
stsci / stpipe (ubuntu-latest)	43s
stsci / roman_datamodels (ubuntu-latest)	1m 57s
astropy / asdf-astropy (ubuntu-latest)	2m 20s
astropy / specutils (ubuntu-latest)	1m 39s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 52s
asdf / asdf-coordinates-schemas (ubuntu-latest)	3m 21s
asdf / asdf-zarr (ubuntu-latest)	37s
third-party / weldx (ubuntu-latest)	2m 32s
asdf / asdf-compression (ubuntu-latest)	32s
third-party / sunpy (ubuntu-latest)	2m 54s
third-party / dkist (ubuntu-latest)	2m 43s
	1h 0m 49s

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