update flake and fix nixfmt after update

templates/basic/flake.nix

@@ -9,11 +9,16 @@
         "aarch64-linux"
         "aarch64-darwin"
       ];
-    in {
-      devShells = forAllSystems (system:
-        let pkgs = import nixpkgs { inherit system; };
-        in {
-          default = pkgs.mkShell { buildInputs = with pkgs; [ nixfmt ]; };
-        });
+    in
+    {
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = import nixpkgs { inherit system; };
+        in
+        {
+          default = pkgs.mkShell { buildInputs = with pkgs; [ nixfmt-rfc-style ]; };
+        }
+      );
     };
 }