Remove next-cookies and prop-types (#14579)

examples/with-firebase-authentication/package.json

@@ -7,15 +7,13 @@
     "start": "next start"
   },
   "dependencies": {
-    "firebase": "^7.6.1",
-    "firebase-admin": "^8.9.0",
+    "firebase": "^7.15.5",
+    "firebase-admin": "^8.12.1",
     "js-cookie": "2.2.1",
     "next": "latest",
-    "next-cookies": "2.0.3",
-    "prop-types": "15.7.2",
-    "react": "^16.12.0",
-    "react-dom": "^16.12.0",
-    "react-firebaseui": "4.0.0",
-    "swr": "0.2.2"
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "react-firebaseui": "4.1.0",
+    "swr": "0.2.3"
   }
 }