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

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

Author: pre-commit-ci[bot]

tests/test_validators.py

@@ -818,7 +818,9 @@ def test_fail_non_mapping(self):
         with pytest.raises(TypeError) as e:
             v(None, a, [1, 2, 3])
 
-        msg = f"'{a.name}' must be a mapping (got [1, 2, 3] that is a {list!r})."
+        msg = (
+            f"'{a.name}' must be a mapping (got [1, 2, 3] that is a {list!r})."
+        )
         assert msg in str(e.value)