Some updates to the tox config #2200

Job	Run time
environment	1s
crds_contexts / retrieve latest CRDS contexts	13s
test / Load tox environments	7s
test_upstream / Load tox environments	4s
test_upstream / rad (ubuntu-latest)	1m 23s
test / py310-oldestdeps-cov (ubuntu-latest)	2m 0s
test / py310 (ubuntu-latest)	1m 26s
test / py311-cov (ubuntu-latest)	1m 53s
test / py312-withromancal-cov (ubuntu-latest)	3m 4s
test / py313 (ubuntu-latest)	1m 36s
test / py311 (macos-latest)	1m 46s
romancal / Load tox environments	5s
romancal / py310-romancal (ubuntu-latest)	1m 10s
	14m 48s

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