Bump docker/setup-qemu-action from 2 to 3 #217

Job	Run time
Ubuntu (x86_64) debug	1m 35s
Windows (x86_64) release (crossbuild from Ubuntu x86_64, MinGW-w64)	2m 9s
Ubuntu (x86_64) release	2m 2s
macOS (x86_64) release	1m 0s
	6m 46s

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