chore: Update libavif to 1.2.0 #144

Job	Run time
sdist	22s
Windows x86	21m 48s
macOS 10.10 x86_64	42m 31s
Windows AMD64	51m 44s
Windows ARM64	13m 15s
macOS 10.13 x86_64	57m 23s
macOS 10.15 x86_64	43m 58s
macOS arm64	31m 53s
manylinux2014 and musllinux x86_64	1h 24m 38s
manylinux_2_28 x86_64	39m 14s
manylinux2014 and musllinux aarch64	19m 41s
manylinux_2_28 aarch64	20m 22s
Upload release to PyPI	0s
Upload wheels to scientific-python-nightly-wheels	0s
	7h 6m 49s

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