docs: strip coremltools import warning from pruning tutorial output

Removes a local scikit-learn/coremltools version warning baked into
the notebook's output; it's environment noise, not tutorial content.

Author: u-simha

docs/src/tutorials/mnist_pruning.ipynb

@@ -429,17 +429,7 @@
    "execution_count": 14,
    "id": "cell-24",
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "W0714 17:27:02.612000 83677 torch/distributed/elastic/multiprocessing/redirects.py:29] NOTE: Redirects are currently not supported in Windows or MacOs.\n",
-      "scikit-learn version 1.9.0 is not supported. Minimum required version: 0.17. Maximum required version: 1.5.1. Disabling scikit-learn conversion API.\n",
-      "Torch version 2.11.0 has not been tested with coremltools. You may run into unexpected errors. Torch 2.7.0 is the most recent version that has been tested.\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "from coreai_opt.pruning import (\n",
     "    MagnitudePruner,\n",