fix: correct import order in OpenAI tracing notebook

Author: viniciusdsmello

examples/tracing/openai/openai_tracing.ipynb

@@ -39,8 +39,8 @@
    "outputs": [],
    "source": [
     "import os\n",
-    "import openai\n",
     "\n",
+    "import openai\n",
     "from pydantic import BaseModel\n",
     "\n",
     "# OpenAI env variables\n",