Revert "luaPackages.luv: 1.30.0-0 -> 1.34.1-1"

[LnL7]

This reverts commit eaa4728.

With 81461cf luv also needs to be
downgraded until luarocks can be updated to 3.3.1 again.

Fixes #82727

Motivation for this change

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[teto]

On the luv issue, as we have no proper fix really (the current fix is just as complicated as the current one), I am fine with this. I have not understood yet if the issue on darwin was random or systematic (i.e., if it could be fixed by trying several times).

[LnL7]

For reference the darwin build worked fine with luarocks-3.3.1 + luv-1.34.1-1 (even without your changes). So once #80528 is resolved we just have to make sure to update both.