message: add override specifier to Dialog._renderOuter
diff: @@ -77,7 +77,7 @@ declare class Dialog<Options extends DialogOptions = DialogOptions> extends Appl
  protected _onKeyDown(event: KeyboardEvent & { key: "Escape" }): ReturnType<Dialog["close"]>;
  protected _onKeyDown(event: KeyboardEvent): void;
  - _renderOuter(): ReturnType<Application["_renderOuter"]>;
  + override _renderOuter(): ReturnType<Application["_renderOuter"]>;
  /**
  * Submit the Dialog by selecting one of its buttons
  