Make use of CPython limited API #141

Job	Run time
Tests with external liberfa	46s
[ ubuntu-latest ]	1m 7s
[ macos-latest ]	3m 48s
[ windows-latest ]	2m 41s
Test with oldest supported versions of our dependencies [ ubuntu-20.04 ]	1m 52s
Test with medium old supported versions of our dependencies [ ubuntu-22.04 ]	1m 21s
Test with development versions of our dependencies [ ubuntu-latest ]	3m 18s
Code style checks [ ubuntu-latest ]	16s
Documentation build [ ubuntu-latest ]	1m 44s
build_and_publish / Load build targets	8s
build_and_publish / Build source distribution	1m 35s
build_and_publish / Build cp3*-manylinux_x86_64 wheels	2m 45s
build_and_publish / Build cp3*-musllinux_x86_64 wheels	2m 23s
build_and_publish / Build cp3*-manylinux_aarch64 wheels	18m 15s
build_and_publish / Build cp3*macosx_x86_64 wheels	7m 10s
build_and_publish / Build cp3*macosx_arm64 wheels	5m 51s
build_and_publish / Build cp3*win32 wheels	6m 6s
build_and_publish / Build cp3*win_amd64 wheels	4m 43s
build_and_publish / Upload	0s
	1h 5m 49s

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