Make asdf standard 1.6.0 stable (default) #2943

Job	Run time
asdf / Load tox environments	5s
stsci / Load tox environments	4s
astropy / Load tox environments	4s
third-party / Load tox environments	6s
stsci / astrocut (ubuntu-latest)	52s
stsci / gwcs (ubuntu-latest)	1m 0s
stsci / jwst (ubuntu-latest)	21m 45s
stsci / stdatamodels (ubuntu-latest)	3m 0s
stsci / stpipe (ubuntu-latest)	41s
stsci / roman_datamodels (ubuntu-latest)	1m 40s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 47s
asdf / asdf-coordinates-schemas (ubuntu-latest)	3m 18s
asdf / asdf-zarr (ubuntu-latest)	31s
asdf / asdf-compression (ubuntu-latest)	32s
astropy / asdf-astropy (ubuntu-latest)	2m 20s
astropy / specutils (ubuntu-latest)	1m 47s
third-party / weldx (ubuntu-latest)	1m 2s
third-party / sunpy (ubuntu-latest)	2m 59s
third-party / dkist (ubuntu-latest)	3m 0s
third-party / abacusutils (ubuntu-latest)	2m 54s
	49m 27s

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