libpng 1.6.40 -> 1.6.42 https://repology.org/project/libpng/versions
attrpath: libpng
Checking auto update branch...
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There might already be an open PR for this update:
- libpng: 1.6.40 -> 1.6.42
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/286253"