Update Safari support note

SIMD support landed upstream (https://bugs.webkit.org/show_bug.cgi?id=222382) shortly after Safari 16.2 was released. It is available in Safari Tech Preview v161 and I expect it to appear in the next stable release, although that is still not available.

README.md

@@ -19,8 +19,7 @@ This Tesseract build has been optimized for use in the browser by:
  download (with Brotli compression).
 
 - Using [WebAssembly SIMD](https://v8.dev/features/simd) when available
- (Chrome >= 91, Firefox >= 90, Safari
- [??](https://bugs.webkit.org/show_bug.cgi?id=222382)) to improve text
+ (Chrome >= 91, Firefox >= 90, Safari >= 16.3) to improve text
  recognition performance.
 
 - Providing a high-level API that can be used to run web pages without blocking