add abacusutils to downstream #2892

Job	Run time
astropy / Load tox environments	8s
stsci / Load tox environments	4s
third-party / Load tox environments	4s
asdf / Load tox environments	4s
stsci / astrocut (ubuntu-latest)	53s
stsci / gwcs (ubuntu-latest)	1m 2s
stsci / jwst (ubuntu-latest)	1m 34s
stsci / stdatamodels (ubuntu-latest)	1m 36s
stsci / stpipe (ubuntu-latest)	40s
stsci / roman_datamodels (ubuntu-latest)	1m 53s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 42s
asdf / asdf-coordinates-schemas (ubuntu-latest)	3m 24s
asdf / asdf-zarr (ubuntu-latest)	34s
asdf / asdf-compression (ubuntu-latest)	28s
third-party / weldx (ubuntu-latest)	2m 23s
third-party / sunpy (ubuntu-latest)	3m 1s
third-party / dkist (ubuntu-latest)	2m 50s
third-party / abacusutils (ubuntu-latest)	3m 0s
astropy / asdf-astropy (ubuntu-latest)	2m 27s
astropy / specutils (ubuntu-latest)	1m 44s
	29m 31s

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