zon2nix support

[colemickens]

Hi,

I know nothing about zig. It seems like there's a new lockfile thing added in recent versions.

it would be fantastic if nix-update supported it like it does Cargo.lock prefetching, etc.

ex: https://git.sr.ht/~leon_plickat/wayprompt/tree/master/item/build.zig.zon

ref: https://github.com/nix-community/zon2nix

extra: https://zig.news/edyu/zig-package-manager-wtf-is-zon-558e

extra: https://github.com/ziglang/zig/blob/master/doc/build.zig.zon.md