Experiment with Python limited API (take 2) #1251

Job	Run time
tests / Load tox environments	4s
tests / py310-test-oldestdeps (macos-latest)	2m 8s
tests / py311-test (macos-latest)	2m 7s
tests / py312-test (macos-latest)	2m 20s
tests / py310-test-oldestdeps (ubuntu-latest)	3m 14s
tests / py311-test (ubuntu-latest)	3m 5s
tests / py312-test (ubuntu-latest)	3m 19s
tests / py312-test-devdeps (ubuntu-latest)	4m 43s
tests / py310-test-oldestdeps (windows-latest)	1m 25s
tests / py311-test (windows-latest)	1m 17s
tests / py312-test (windows-latest)	1m 10s
publish	0s
	24m 52s

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