'center.parent == this' error in low version flutter after rebuildCustomScrollView is removed

https://github.com/flutter/flutter/issues/55170

workaround:

```dart
LoadingMoreCustomScrollView(
  slivers: [
    SliverToBoxAdapter(), // Bug fix: https://github.com/flutter/flutter/issues/55170
    LoadingMoreSliverList()
  ]
)
```
