drop 311 and regen lockfiles (#397) #659

Job	Run time
Build sdist	12s
build ubuntu-latest (x86_64) wheels	14m 21s
build macos-latest (arm64) wheels	1m 29s
build windows-latest (AMD64) wheels	4m 42s
build macos-latest (x86_64) wheels	4m 34s
Show artifacts	3s
Publish to Test PyPI	40s
Publish to PyPI	0s
	26m 1s

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