chore: clear linting errors

dzgui/util/margins.py

@@ -1,6 +1,6 @@
-import gi  # noqa E402
+import gi
 gi.require_version("Gtk", "3.0")
-from gi.repository import Gtk
+from gi.repository import Gtk  # noqa E402
 
 def set_surrounding_margins(widget: Gtk.Widget, margin: int) -> None:
     """