message: Update ItemSheet for v9
  Closes
diff: @@ -26,6 +26,7 @@ declare global {
  * resizable: true,
  * baseApplication: "ItemSheet",
  * id: "item"
  + * })
  * ```
  */
  static get defaultOptions(): ItemSheet.Options;
  @@ -37,7 +38,7 @@ declare global {
  get title(): string;
  /**
  - * A convenience reference to the Item entity
  + * A convenience reference to the Item document
  */
  get item(): this['object'];
  @@ -57,19 +58,12 @@ declare global {
  */
  getData(options?: Partial<Options>): Data | Promise<Data>;
  - /** @override */
  - protected _getHeaderButtons(): Application.HeaderButton[];
  -
  /** @override */
  activateListeners(html: JQuery): void;
  - /**
  - * Handle requests to configure the default sheet used by this Item
  - */
  - protected _onConfigureSheet(event: JQuery.ClickEvent): void;
  -
  /**
  * Handle changing the item image
  + * @internal
  */
  protected _onEditImage(event: JQuery.ClickEvent): ReturnType<FilePicker['browse']>;
  }
  