fix(today)：qa中的最后一条滚动

@@ -158,6 +158,7 @@ class _TodayFaqBottomSheetState extends State<TodayFaqBottomSheet> {
               child: ListView(
                 controller: widget.scrollController,
                 physics: const ClampingScrollPhysics(),
+                cacheExtent: double.infinity,
                 padding: const EdgeInsets.fromLTRB(16, 8, 16, 20),
                 children: [
                   _InfoCard(