added dict[any, any] as type hint for children

xarray/tests/test_formatting_html.py

@@ -264,7 +264,7 @@ def test_empty_mapping(self):
         """
         Test with an empty mapping of children.
         """
-        children = {}  # type: Dict[Any, Any]
+        children: dict[any, any] = {}
         assert self.func(children) == (
             "<div style='display: inline-grid; grid-template-columns: 100%'>" "</div>"
         )