Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: crystal_1_15 1.15.1 -> 1.21.0 https://github.com/crystal-lang/crystal/releases
attrpath: crystal_1_15
Checking auto update branch...
No auto update branch exists
Version in attr path crystal_1_15 not compatible with 1.21.0