style: format Python files with Ruff

tests/test_todoupdate.py

@@ -8,14 +8,16 @@ def test_todoupdate_rejects_empty_update() -> None:
     with pytest.raises(ValidationError):
         todoupdate()
 
+
 def test_todoupdate_accepts_provided_value() -> None:
     update_data = todoupdate(
-            task = "学习测试单元",
-            completion = True,
-        )
+        task="学习测试单元",
+        completion=True,
+    )
 
     assert update_data.task == "学习测试单元"
 
+
 def test_todoupdate_accepts_task_only() -> None:
     update_data = todoupdate(task="修改后的任务")