CI: Use cache-nix-action f68581e27a06c8c9115dec37e42325d562d9664b#23

runeksvendsen merged 3 commits intomainruneksvendsen/haskell-function-graph:mainfrom

cache-nix-action-f68581e27a06c8c9115dec37e42325d562d9664bruneksvendsen/haskell-function-graph:cache-nix-action-f68581e27a06c8c9115dec37e42325d562d9664bCopy head branch name to clipboard