Merge pull request #62 from astrofrog/bump-minimum-python-39 #182

Job	Run time
publish / Load build targets	10s
publish / Build cp*-manylinux_x86_64 wheels	2m 2s
publish / Build source distribution	49s
publish / Build cp*-manylinux_aarch64 wheels	3m 0s
publish / Build pp39-manylinux_x86_64 wheels	3m 8s
publish / Build cp*-macosx_x86_64 wheels	7m 36s
publish / Build cp*-macosx_arm64 wheels	58s
publish / Build pp39-macosx_x86_64 wheels	8m 15s
publish / Build cp*-win32 wheels	4m 3s
publish / Build cp*-win_amd64 wheels	4m 59s
publish / Build pp39-win_amd64 wheels	4m 34s
publish / Upload	0s
	39m 34s

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