[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

tests/data/notebooks/example-py.ipynb

@@ -10,7 +10,7 @@
     "from pathlib import Path\n",
     "\n",
     "r = random.randint(0, 10)\n",
-    "Path(\"int.txt\").write_text(str(r))\n"
+    "Path(\"int.txt\").write_text(str(r))"
    ]
   }
  ],

tests/test_runner.py

@@ -7,6 +7,7 @@
 import pytest
 from nbclient.exceptions import CellExecutionError
 from nbformat import v4
+
 from prelude_runner.cli import load_preludes, main
 from prelude_runner.core import Preludes, execute
 from prelude_runner.types import CodeCell, Notebook, Stream