Re-add PyPy compatibility. #1136

Job	Run time
Lint Python (3.12, ubuntu-20.04)	8s
Pre-build on macos-13 with clang	1m 5s
Pre-build on ubuntu-20.04 with gcc	1m 37s
Lint C++	31s
Pre-build on ubuntu-20.04 with clang	37s
Build wheel for ${{ matrix.build }}	0s
Test with Python 3.7 + Address Sanitizer	7m 5s
Test with Python 3.8 + Address Sanitizer	7m 59s
Test with Python 3.9 + Address Sanitizer	8m 39s
Test with Python 3.10 + Address Sanitizer	7m 32s
Test with Python 3.11 + Address Sanitizer	7m 23s
Test 1 / 8 with Python 3.12 on ubuntu-20.04	1m 13s
Test with Python 3.7 on macos-13	9m 43s
Test 2 / 8 with Python 3.12 on ubuntu-20.04	1m 10s
Test with Python 3.8 on macos-13	9m 48s
Test 3 / 8 with Python 3.12 on ubuntu-20.04	1m 15s
Test with Python 3.9 on macos-13	10m 20s
Test 4 / 8 with Python 3.12 on ubuntu-20.04	1m 18s
Test with Python 3.10 on macos-13	10m 33s
Test 5 / 8 with Python 3.12 on ubuntu-20.04	1m 22s
Test with Python 3.11 on macos-13	12m 17s
Test 6 / 8 with Python 3.12 on ubuntu-20.04	1m 8s
Test with Python 3.12 on macos-13	11m 20s
Test 7 / 8 with Python 3.12 on ubuntu-20.04	1m 24s
Test with Python 3.7 on ubuntu-20.04	5m 4s
Test 8 / 8 with Python 3.12 on ubuntu-20.04	1m 13s
Test with Python 3.8 on ubuntu-20.04	5m 41s
Test with Python 3.9 on ubuntu-20.04	5m 36s
Test with Python 3.10 on ubuntu-20.04	5m 23s
Test with Python 3.11 on ubuntu-20.04	5m 37s
Test with Python 3.12 on ubuntu-20.04	5m 18s
Test with Python 3.12 on windows-latest	10m 14s
Upload wheels to PyPI	0s
	2h 39m 33s

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