nix: update nixpkgs, remove zig.hook, and remove x11-gnome

[MithicSpirit]

As of NixOS/nixpkgs#473413, zig.hook no longer supports zig_default_flags, and now they can and must be provided in zigBuildFlags instead.

Updating also requires removing gnome-xorg since it has been removed from nixpkgs.

nix flake check succeeds on my system (x86_64-linux), with a couple deprecation warnings that I believe aren't important.

[MithicSpirit]

I think the failures are an OOM error or something like that because it's having to recompile zig, which seems to be pulled in by zon2nix, since it still uses zig_default_flags. I'll try changing it to not need that.

[pluiedev]

I'm happy to merge this as a temporary fix, pending CI. Later please follow through with this and make a PR on the zon2nix repo, and then remove the overridden zon2nix here :)

[jcollie]

I've updated zon2nix to be compatible with the Zig hook changes in nixpkgs.

[MithicSpirit]

I've updated zon2nix to be compatible with the Zig hook changes in nixpkgs.

@jcollie really? The latest commit on jcollie/zon2nix is still using zig_default_flags. Maybe you forgot to push?

[jcollie]

Whoops, yeah forgot to push.

[MithicSpirit]

I don't think the CI failures are my fault? I guess maybe updating nixpkgs updated dependencies like the spellchecker, which could be causing the failures. Regardless, I can try to fix them if desired. The action pins and typos seem pretty straightforward, but I'm not sure what should be done about the HttpConnectionClosing in test.

[jcollie]

The HttpConnectionClosing is typically a transient networking error that can be "fixed" by retrying. The typos failure is probably caused by a newer version of typos being pickier. The GH actions pins may be a similar issue. Both of those should get fixed in this PR.