Clean up test dependencies, add python 3.12 testing #2636

Job	Run time
jsonschema	0s
asdf-schemas / Load tox environments	13s
core / Load tox environments	8s
dev312 / Load tox environments	10s
core / Python 3.11 coverage	2m 33s
core / Python 3.10 coverage	3m 18s
core / Python 3.9 coverage	3m 10s
dev312 / devdeps (ubuntu-latest)	7m 23s
asdf-schemas / asdf-standard (ubuntu-latest)	1m 3s
asdf-schemas / asdf-transform-schemas (ubuntu-latest)	1m 43s
asdf-schemas / asdf-unit-schemas (ubuntu-latest)	54s
oldest / Load tox environments	6s
compatibility / Load tox environments	8s
dev / Load tox environments	10s
package / Build source and wheel distribution	3m 14s
test / Load tox environments	9s
oldest / py39-oldestdeps-parallel (ubuntu-latest)	1m 39s
compatibility / compatibility (ubuntu-latest)	3m 25s
test / py39-parallel (macos-latest)	1m 45s
test / py39-parallel (windows-latest)	2m 41s
dev / py39-devdeps-parallel (ubuntu-latest)	7m 37s
dev / py310-devdeps-parallel (ubuntu-latest)	8m 13s
dev / py311-devdeps-parallel (ubuntu-latest)	7m 48s
	57m 30s

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