Add parallel compile from pybind11 #868

Job	Run time
sdist	21s
Windows ARM64	15m 34s
Windows x86	28m 54s
Windows AMD64	37m 45s
macOS arm64	27m 29s
macOS 10.15 x86_64	24m 53s
macOS 10.13 x86_64	28m 11s
macOS 10.10 x86_64	19m 31s
manylinux_2_28 x86_64	30m 37s
manylinux_2_28 aarch64	27m 4s
manylinux2014 and musllinux x86_64	1h 3m 2s
manylinux2014 and musllinux aarch64	49m 41s
Upload release to PyPI	0s
Upload wheels to scientific-python-nightly-wheels	0s
	5h 53m 2s

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