Unpin urllib3 #766

Job	Run time
Build pure python wheels (3.9)	8s
Build macos wheels (cross-compiles arm64)	3m 22s
Build source distribution	1s
Build python 3.8+ manylinux2014 wheels	14m 33s
Build python 3.8+ manylinux_2_28 wheels	14m 49s
upload_pypi	0s
	32m 53s

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