chore: update phoenix to version 1.8.0-rc.3

lib/mv_web/controllers/page_controller.ex

@@ -2,8 +2,6 @@ defmodule MvWeb.PageController do
   use MvWeb, :controller
 
   def home(conn, _params) do
-    # The home page is often custom made,
-    # so skip the default app layout.
-    render(conn, :home, layout: false)
+    render(conn, :home)
   end
 end