Bump docker/metadata-action from 4 to 5 #200

Job	Run time
Ubuntu (x86_64) debug	1m 6s
Ubuntu (x86_64) release	1m 53s
macOS (x86_64) release	1m 10s
Windows (x86_64) release (crossbuild from Ubuntu x86_64, MinGW-w64)	1m 52s
	6m 1s

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