clean 3.0 -> 3.1 https://repology.org/project/clean-lang/versions
attrpath: clean
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There might already be an open PR for this update:
- defaultPkgConfigPackages: generate assignments from meta.pkgConfigModule entries
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/216488"
- nix: put each version in a separate file
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/211172"