switch convert_unknown_ndarray_subclasses to False #2941

Job	Run time
stsci / Load tox environments	4s
astropy / Load tox environments	7s
asdf / Load tox environments	7s
third-party / Load tox environments	3s
third-party / weldx (ubuntu-latest)	1m 2s
third-party / sunpy (ubuntu-latest)	3m 2s
third-party / dkist (ubuntu-latest)	2m 35s
third-party / abacusutils (ubuntu-latest)	2m 50s
stsci / astrocut (ubuntu-latest)	57s
stsci / gwcs (ubuntu-latest)	1m 2s
stsci / jwst (ubuntu-latest)	3m 34s
stsci / stdatamodels (ubuntu-latest)	2m 4s
stsci / stpipe (ubuntu-latest)	42s
stsci / roman_datamodels (ubuntu-latest)	1m 39s
astropy / asdf-astropy (ubuntu-latest)	2m 25s
astropy / specutils (ubuntu-latest)	1m 39s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 44s
asdf / asdf-coordinates-schemas (ubuntu-latest)	3m 23s
asdf / asdf-zarr (ubuntu-latest)	30s
asdf / asdf-compression (ubuntu-latest)	31s
	30m 0s

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