diff-pdf 0.5 -> 0.5.1 https://github.com/vslavik/diff-pdf/releases
attrpath: diff-pdf
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There might already be an open PR for this update:
- Frozen haskellPackages set for 21.05 to ease backporting bug fix releases
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/138407"