Clean up test dependencies, add python 3.12 testing #2596

Job	Run time
jsonschema	0s
asdf-schemas / Load tox environments	9s
core / Load tox environments	6s
dev312 / Load tox environments	11s
core / Python 3.11 coverage	2m 10s
core / Python 3.10 coverage	2m 27s
core / Python 3.9 coverage	2m 28s
asdf-schemas / asdf-standard (ubuntu-latest)	57s
asdf-schemas / asdf-transform-schemas (ubuntu-latest)	1m 21s
asdf-schemas / asdf-unit-schemas (ubuntu-latest)	41s
dev312 / devdeps (ubuntu-latest)	3m 8s
oldest / Load tox environments	10s
dev / Load tox environments	5s
compatibility / Load tox environments	10s
package / Build source and wheel distribution	4m 37s
test / Load tox environments	7s
dev / py39-devdeps-parallel (ubuntu-latest)	2m 14s
dev / py310-devdeps-parallel (ubuntu-latest)	1m 40s
dev / py311-devdeps-parallel (ubuntu-latest)	1m 35s
oldest / py39-oldestdeps-parallel (ubuntu-latest)	1m 35s
compatibility / compatibility (ubuntu-latest)	3m 27s
test / py39-parallel (macos-latest)	1m 29s
test / py39-parallel (windows-latest)	2m 49s
	33m 36s

Provide feedback