fix overrides (#1489)

Co-authored-by: Ellet <73608287+freshtechtips@users.noreply.github.com>

lib/src/widgets/quill_single_child_scroll_view.dart

@@ -288,8 +288,12 @@ class _RenderSingleChildViewport extends RenderBox
   }
 
   @override
-  RevealedOffset getOffsetToReveal(RenderObject target, double alignment,
-      {Rect? rect}) {
+  RevealedOffset getOffsetToReveal(
+    RenderObject target,
+    double alignment, {
+    Rect? rect,
+    Axis? axis, // Unused, only Axis.vertical supported by this viewport.
+  }) {
     rect ??= target.paintBounds;
     if (target is! RenderBox) {
       return RevealedOffset(offset: offset.pixels, rect: rect);