Fix @hello-pangea/dnd type error

typings/@hello-pangea/dnd/index.d.ts

@@ -0,0 +1,16 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import { PreDragActions } from '@hello-pangea/dnd';
+
+declare module '@hello-pangea/dnd' {
+  export * from '@hello-pangea/dnd';
+
+  // TODO: This type can be imported directly from @hello-pangea/dnd once on v16.3.0, which requires Webpack v5
+  export type FluidDragActions = ReturnType<PreDragActions['fluidLift']>;
+}