Upgrade to macos-12 #2941

Job	Run time
docker-builds (mingw64, docker/libddwaf/gcc/mingw64/Dockerfile, libddwaf-linux-mingw64)	3m 44s
linux-musl-build (x86_64, x86_64, amd64, linux/amd64, libddwaf-x86_64-linux-musl, ubuntu-latest)	9m 37s
linux-musl-build (i386, i386, i386, linux/386, libddwaf-i386-linux-musl, ubuntu-latest)	9m 1s
macos-cross-build	1m 39s
macos-build	4m 55s
linux-musl-build (aarch64, aarch64, arm64, linux/arm64, libddwaf-aarch64-linux-musl, arm-4core-li...	8m 38s
linux-musl-build (armv7, armv7, arm, linux/arm/v7, libddwaf-armv7-linux-musl, arm-4core-linux)	8m 50s
windows-builds (Win32)	12m 22s
windows-builds (x64)	11m 37s
macos-universal-package	28s
package-nuget	27s
release	0s
	1h 11m 18s

Provide feedback