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

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

tests/test_runtime_errors.py

@@ -238,11 +238,11 @@ def test_directory_without_notebooks(capsys: "CaptureFixture") -> None:
     main(["black", "docs"])
     _, err = capsys.readouterr()
     expected_err = (
-        'No valid notebooks found in given path(s)\n'
-        '\n'
-        '\x1b[1m\n'
-        'If you believe the notebook(s) to be valid, please report a bug at '
-        'https://github.com/nbQA-dev/nbQA/issues \x1b[0m\n'
-        '\n'
+        "No valid notebooks found in given path(s)\n"
+        "\n"
+        "\x1b[1m\n"
+        "If you believe the notebook(s) to be valid, please report a bug at "
+        "https://github.com/nbQA-dev/nbQA/issues \x1b[0m\n"
+        "\n"
     )
     assert err == expected_err