fix(notebook): pin typing_extensions>=4.13.0 to fix pydantic Sentinel ImportError

training/train_grpo.ipynb

@@ -31,7 +31,7 @@
         "!pip install -q torch torchvision torchaudio\n",
         "!pip install -q \"transformers>=4.45.0\" \"accelerate\" \"peft>=0.10.0\" \"trl>=0.20.0\" \"datasets\" \"bitsandbytes\"\n",
         "!pip install -q matplotlib pandas\n",
-        "!pip install -q pydantic httpx\n",
+        "!pip install -q \"typing_extensions>=4.13.0\" pydantic httpx\n",
         "!pip install -q \"openenv-core[core]>=0.2.2\""
       ],
       "execution_count": 1,