fix(TransitionGroup): reset prevChildren in to prevent memory leak

Author: edison1105

Diff for: packages/runtime-dom/src/components/TransitionGroup.ts

@@ -81,6 +81,7 @@ const TransitionGroupImpl: ComponentOptions = /*@__PURE__*/ decorate({
           moveClass,
         )
       ) {
+        prevChildren = []
         return
       }