add abacusutils to downstream #2898

Job	Run time
third-party / Load tox environments	8s
astropy / Load tox environments	9s
stsci / Load tox environments	5s
asdf / Load tox environments	9s
stsci / astrocut (ubuntu-latest)	46s
stsci / gwcs (ubuntu-latest)	59s
stsci / jwst (ubuntu-latest)	19m 6s
stsci / stdatamodels (ubuntu-latest)	1m 48s
stsci / stpipe (ubuntu-latest)	36s
stsci / roman_datamodels (ubuntu-latest)	2m 1s
astropy / asdf-astropy (ubuntu-latest)	2m 36s
astropy / specutils (ubuntu-latest)	1m 41s
third-party / weldx (ubuntu-latest)	2m 24s
third-party / sunpy (ubuntu-latest)	2m 55s
third-party / dkist (ubuntu-latest)	2m 46s
third-party / abacusutils (ubuntu-latest)	3m 4s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 46s
asdf / asdf-coordinates-schemas (ubuntu-latest)	3m 19s
asdf / asdf-zarr (ubuntu-latest)	36s
asdf / asdf-compression (ubuntu-latest)	29s
	47m 23s

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