_imaging module cleanup #466

Job	Run time
aarch64 pp310 manylinux2014	2h 18m 44s
aarch64 pp310 manylinux_2_28	2h 35m 13s
aarch64 cp3{9,10,11} manylinux2014	2h 10m 56s
aarch64 cp3{9,10,11} manylinux_2_28	2h 20m 46s
macOS 10.10 x86_64	19m 31s
aarch64 cp3{9,10,11} musllinux	2h 11m 56s
macOS 10.13 x86_64	21m 5s
aarch64 cp3{12,13} manylinux2014	1h 54m 55s
macOS 10.15 x86_64	14m 54s
aarch64 cp3{12,13} manylinux_2_28	2h 4m 28s
macOS arm64	18m 22s
aarch64 cp3{12,13} musllinux	1h 58m 29s
manylinux2014 and musllinux x86_64	37m 41s
manylinux_2_28 x86_64	18m 27s
sdist	37s
Windows x86	17m 46s
Windows AMD64	31m 28s
Windows ARM64	12m 40s
Upload wheels to scientific-python-nightly-wheels	0s
Upload release to PyPI	0s
	20h 47m 58s

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