skip version cell

ch03/01_main-chapter-code/multihead-attention.ipynb

@@ -34,6 +34,7 @@
     }
    ],
    "source": [
+    "# NBVAL_IGNORE_OUTPUT\n",
     "from importlib.metadata import version\n",
     "\n",
     "print(\"torch version:\", version(\"torch\"))"