Fix TypeScript error in Target

src/ol/events/Target.js

@@ -72,7 +72,8 @@ class Target extends Disposable {
    * Object with a `type` property.
    *
    * @param {{type: string,
-   *     target: (EventTargetLike|undefined)}|
+   *     target: (EventTargetLike|undefined),
+   *     propagationStopped: (boolean|undefined)}|
    *     import("./Event.js").default|string} event Event object.
    * @return {boolean|undefined} `false` if anyone called preventDefault on the
    *     event object or if any of the listeners returned false.