use unstable packages

modules/apps/default.nix

@@ -8,8 +8,8 @@
   ];
   home-manager.users.moritz.home.packages = with pkgs; [
     neofetch
-    keepassxc
-    spotify
+    unstable.keepassxc
+    unstable.spotify
     spicetify-cli
   ];
 }

overlays/default.nix

@@ -4,4 +4,8 @@ final: prev: {
   picom = prev.picom.overrideAttrs (old: {
     src = inputs.picom;
   });
+  unstable = import inputs.unstable {
+    system = prev.system;
+    config.allowUnfree = true;
+  };
 }