run ruff in CI

grid/test/test_pattern.py

@@ -1,7 +1,7 @@
 from grid.ui.pattern import Pattern
 
-class TestPattern():
 
+class TestPattern:
     def test_position(self):
         p = Pattern(500, 500)
-        assert len(p.childItems()) > 0
+        assert len(p.childItems()) > 0