This upgrades the default version of zig to zig_0_12, which builds
reproducibly on darwin.
Fixes#299091.
Also upgrades all packages compatible with zig 0.12 to that version.
I tried to upgrade packages currently pinning 0.11 as well, but only a
few worked.
Co-authored-by: Weijia Wang (wegank) <contact@weijia.wang>