darwin/homebrew: enable greedycasks

make sure casks are kept up to date

Author: khaneliman

modules/darwin/tools/homebrew/default.nix

@@ -31,6 +31,8 @@ in
         autoUpdate = true;
       };
 
+      greedyCasks = true;
+
       onActivation = {
         autoUpdate = true;
         cleanup = "uninstall";