Drop jsonschema #2191

Job	Run time
astropy / Load tox environments	8s
asdf / Load tox environments	8s
stsci / Load tox environments	11s
third-party / Load tox environments	7s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 30s
asdf / asdf-coordinates-schemas (ubuntu-latest)	2m 47s
astropy / asdf-astropy (ubuntu-latest)	3m 1s
stsci / gwcs (ubuntu-latest)	1m 40s
stsci / jwst (ubuntu-latest)	1m 29s
stsci / stdatamodels (ubuntu-latest)	2m 36s
stsci / stpipe (ubuntu-latest)	54s
stsci / roman_datamodels (ubuntu-latest)	1m 44s
third-party / weldx (ubuntu-latest)	3m 26s
third-party / sunpy (ubuntu-latest)	2m 34s
third-party / dkist (ubuntu-latest)	11m 24s
	33m 39s

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