Update transformers version in llm-agent-mcp notebook (#3569)

Author: aleksandr-mokrov

notebooks/llm-agent-mcp/llm-agent-mcp.ipynb

@@ -84,7 +84,7 @@
     "%pip uninstall -q -y optimum optimum-intel\n",
     "%pip install --pre -Uq openvino-genai --extra-index-url https://storage.openvinotoolkit.org/simple/wheels/nightly\n",
     "%pip install -q --extra-index-url https://download.pytorch.org/whl/cpu \\\n",
-    "\"torch==2.8\" \"nncf>=2.18.0\" \"datasets<4.0.0\" \"accelerate\" \"transformers==4.53.3\" \"mcp-server-time\" \"mcp-server-fetch\"\n",
+    "\"torch==2.8\" \"nncf>=2.18.0\" \"datasets<4.0.0\" \"accelerate\" \"transformers==4.57.6\" \"mcp-server-time\" \"mcp-server-fetch\"\n",
     "\"pydantic==2.9.2\" \"pydantic-core==2.23.4\" \"gradio>=5.0.0,<6\" \"gradio-client==1.4.0\" \"modelscope_studio==1.0.0-beta.8\"\n",
     "%pip install -q --extra-index-url https://download.pytorch.org/whl/cpu \\\n",
     "\"git+https://github.com/huggingface/optimum-intel.git\"\n",