fix(deps): update dependency next to v11 [security]

Author: renovate-bot

app/package.json

@@ -11,7 +11,7 @@
     "@moltin/request": "2.0.2",
     "@zeit/next-css": "1.0.1",
     "final-form": "4.20.7",
-    "next": "9.5.5",
+    "next": "11.1.0",
     "react": "16.14.0",
     "react-dom": "16.14.0",
     "react-final-form": "6.5.9",