Use the larger x64 macOS runner for release builds #457

Job	Run time
macos-aarch64	7m 39s
macos-x86_64	9m 7s
linux (x86_64-unknown-linux-gnu)	8m 19s
sdist	7m 23s
linux (i686-unknown-linux-gnu)	12m 47s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	9m 46s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le)	8m 45s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	8m 15s
linux-s390x (s390x-unknown-linux-gnu, s390x)	12m 22s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64)	9m 21s
linux-arm (arm-unknown-linux-musleabihf, arm)	7m 59s
musllinux (x86_64-unknown-linux-musl)	8m 21s
windows (x86_64-pc-windows-msvc, x64)	13m 53s
musllinux (i686-unknown-linux-musl)	8m 13s
windows (i686-pc-windows-msvc, x86)	13m 58s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	8m 43s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	8m 12s
musllinux-cross (powerpc64le-unknown-linux-musl, ppc64le, nightly)	7m 12s
	2h 50m 15s

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