fix: remove unused package import

1. datetime is unused

examples/vector_databases/pinecone/Gen_QA.ipynb

@@ -660,7 +660,6 @@
       ],
       "source": [
         "from tqdm.auto import tqdm\n",
-        "import datetime\n",
         "from time import sleep\n",
         "\n",
         "batch_size = 100  # how many embeddings we create and insert at once\n",