docs: remove mentions of pydantic_v1 in tutorials (#1709)

docs/docs/tutorials/extraction/retries.ipynb

@@ -394,7 +394,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from langchain_core.pydantic_v1 import BaseModel, Field, validator\n",
+    "# NOTE: you must use langchain-core >= 0.3 with Pydantic v2\n",
+    "from pydantic import BaseModel, Field, field_validator\n",
     "\n",
     "\n",
     "class Respond(BaseModel):\n",
@@ -403,7 +404,7 @@
     "    reason: str = Field(description=\"Step-by-step justification for the answer.\")\n",
     "    answer: str\n",
     "\n",
-    "    @validator(\"answer\")\n",
+    "    @field_validator(\"answer\")\n",
     "    def reason_contains_apology(cls, answer: str):\n",
     "        if \"llama\" not in answer.lower():\n",
     "            raise ValueError(\n",
@@ -1038,7 +1039,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.2"
+   "version": "3.11.9"
   }
  },
  "nbformat": 4,