fix typo

flake.nix

@@ -1,7 +1,7 @@
 {
 	description = "A simple NixOS flake";
 
-	outputs = inputs: inputs.flake-parts.lib.mkFlake { inherit inputs; } (inputs.import-tree ./modules)
+	outputs = inputs: inputs.flake-parts.lib.mkFlake { inherit inputs; } (inputs.import-tree ./modules);
 
 	inputs = {
 		# NixOS official package source, using the nixos-26.05 branch here