Remove stale type ignore from notebook task test

Author: tobiasraabe

tests/test_jupyter/test_task_generator.ipynb

@@ -37,7 +37,7 @@
     "):\n",
     "    for path in paths:\n",
     "\n",
-    "        @task  # type: ignore[arg-type]\n",
+    "        @task\n",
     "        def task_copy(\n",
     "            path: Path = path,\n",
     "        ) -> Annotated[str, path.with_name(path.stem + \"-copy.txt\")]:\n",