fixup test data

tests/data/markdown_then_imports.ipynb

@@ -13,19 +13,35 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import os\n",
+    "import os"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
     "import sys"
    ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3.10.6 ('.venv': venv)",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
   "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
    "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
    "version": "3.10.6"
   },
   "vscode": {
@@ -35,5 +51,5 @@
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }