fix: examples/todo-list/nextjs-todo-list/package.json & examples/todo-list/nextjs-todo-list/package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NODEFETCH-2964180

examples/todo-list/nextjs-todo-list/package.json

@@ -10,7 +10,7 @@
   "dependencies": {
     "@supabase/supabase-js": "^1.28.0",
     "@supabase/ui": "^0.36.0",
-    "next": "^11.1.1",
+    "next": "^12.0.9",
     "react": "^17.0.1",
     "react-dom": "^17.0.1"
   },