Fix compilation warning in test controller

Author: jonasschmidt

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         include:
           - elixir: 1.15.8
-            otp: 24.3.4.17
+            otp: 25.3.2.9
           - elixir: 1.18.1
             otp: 27.2
     env:

test/support/remote_schema_server.ex

@@ -1,5 +1,5 @@
 defmodule SamplePhoenix.SampleController do
-  use Phoenix.Controller
+  use Phoenix.Controller, formats: [json: "View"]
 
   def show(conn, %{"path" => path}) do
     test_path = Path.join(__DIR__, "..") |> Path.expand()