Clean up test dependencies, add python 3.12 testing #2632

Job	Run time
jsonschema	0s
asdf-schemas / Load tox environments	12s
core / Load tox environments	6s
dev312 / Load tox environments	7s
core / Python 3.11 coverage	2m 34s
core / Python 3.10 coverage	3m 48s
core / Python 3.9 coverage	3m 42s
dev312 / devdeps (ubuntu-latest)	10s
asdf-schemas / asdf-standard (ubuntu-latest)	1m 7s
asdf-schemas / asdf-transform-schemas (ubuntu-latest)	1m 34s
asdf-schemas / asdf-unit-schemas (ubuntu-latest)	40s
compatibility / Load tox environments	1s
oldest / Load tox environments	3s
test / Load tox environments	1s
dev / Load tox environments	3s
package / Build source and wheel distribution	1s
test / ${{ matrix.name }}	1s
compatibility / ${{ matrix.name }}	1s
oldest / ${{ matrix.name }}	1s
dev / ${{ matrix.name }}	1s
	14m 13s

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