nekoray: switch to maintained fork, 3.26 -> 4.2.12

[TomaSajt]

Related:

• Update request: Nekoray 3.26 → 4.0.1 #365716
• Update request: Nekoray 3.26 → 4.0.1 #365716 (comment)
• nekoray: 3.26 -> 4.0.1 #368385

MatsuriDayo/nekoray has recently been archived and is no longer maintained. Mahdi-zarei/nekoray is an active fork.

I don't know how to use this software properly, so testing is very much appreciated.

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This fork has removed the custom submodule logic, significantly reducing the number of required source FODs.

Also, I moved the nekobox-core package definition into the package.nix file, as it's not too long.
(nekoray-core has been removed both in the latest original upstream and the new upstream)

In this version, the geoip.db and geoside.db files will be downloaded to ~/.config/nekoray/. I could patch it back so that it always uses the nixpkgs-provided files. Should I?

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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