fix(types): support boolean as a11y value (#8157)

Co-authored-by: farseekers <[email protected]>

Author: farseekers

src/types/swiper-options.d.ts

@@ -892,7 +892,7 @@ export interface SwiperOptions {
    * });
    * ```
    */
-  a11y?: A11yOptions;
+  a11y?: A11yOptions | boolean;
 
   /**
    * Object with autoplay parameters or boolean `true` to enable with default settings