CQ. NodeListImpl works with AstNodeImpl.

Change-Id: I40dbbd0e5a28f90aae375aaa4c539f01665907a4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/449076
Commit-Queue: Konstantin Shcheglov <[email protected]>
Reviewed-by: Johnni Winther <[email protected]>

Author: scheglov

pkg/analyzer/lib/src/dart/ast/ast.dart

@@ -17214,7 +17214,7 @@ abstract final class NodeList<E extends AstNode> implements List<E> {
   E removeAt(int index);
 }
 
-final class NodeListImpl<E extends AstNode>
+final class NodeListImpl<E extends AstNodeImpl>
     with ListMixin<E>
     implements NodeList<E> {
   late final AstNodeImpl _owner;