[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_qtwidget.py

@@ -90,7 +90,6 @@ def assert_call(self):
     assert_allclose(m.limits["a"], (-1, 0), atol=1e-5)
     assert_allclose(m.values, (0, 0), atol=1e-5)
 
-
     class Cost:
         def visualize(self, args):
             return plot(args)