Drop jsonschema #2595

Job	Run time
jsonschema	0s
core / Load tox environments	8s
asdf-schemas / Load tox environments	7s
core / Python 3.11 coverage	11m 59s
core / Python 3.10 coverage	13m 53s
core / Python 3.9 coverage	10m 41s
asdf-schemas / asdf-standard (ubuntu-latest)	1m 0s
asdf-schemas / asdf-transform-schemas (ubuntu-latest)	1m 34s
asdf-schemas / asdf-unit-schemas (ubuntu-latest)	43s
oldest / Load tox environments	8s
dev / Load tox environments	6s
compatibility / Load tox environments	7s
package / Build source and wheel distribution	4m 58s
test / Load tox environments	4s
dev / py39-devdeps-parallel (ubuntu-latest)	3m 41s
dev / py310-devdeps-parallel (ubuntu-latest)	4m 57s
dev / py311-devdeps-parallel (ubuntu-latest)	4m 30s
oldest / py39-oldestdeps-parallel (ubuntu-latest)	2m 24s
compatibility / compatibility (ubuntu-latest)	3m 50s
test / py39-parallel (macos-latest)	2m 28s
test / py39-parallel (windows-latest)	6m 53s
	1h 14m 11s

Provide feedback