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

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

testing/code/test_excinfo.py

@@ -63,7 +63,7 @@ def test_excinfo_from_exception_simple() -> None:
 
 
 def test_excinfo_from_exception_missing_traceback_assertion() -> None:
-    with pytest.raises(AssertionError, match=r'must have.*__traceback__'):
+    with pytest.raises(AssertionError, match=r"must have.*__traceback__"):
         _pytest._code.ExceptionInfo.from_exception(ValueError())