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

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

Author: pre-commit-ci[bot]

testing/python/approx.py

@@ -143,9 +143,9 @@ def test_negative_tolerance(
 
     def test_negative_tolerance_message(self):
         # Error message for negative tolerance should include the value.
-        with pytest.raises(ValueError, match='-3'):
+        with pytest.raises(ValueError, match="-3"):
             0 == approx(1, abs=-3)
-        with pytest.raises(ValueError, match='-3'):
+        with pytest.raises(ValueError, match="-3"):
             0 == approx(1, rel=-3)
 
     def test_inf_tolerance(self):