libpsl: enable Windows builds

[greg-hellings]

Bringing python3 into the mix breaks Windows builds, which in turn
prevents curl from building on Windows in the default configuration for
nixpkgs. Excluding python3 from the buildInputs on Windows prevents that
problem

The rest of the changes are nixfmt changes

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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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[greg-hellings]

Related to #351010 but that fix still doesn't enable the default pyhthon 3.12 package to build, so this package would need to pull python311 specifically for Windows targets.

[Aleksanaa]

Since it's still an exotic platform, I'd assume it works, lgtm as long as it doesn't break others