IOS 16.4.1 build 20E252

iOS 16.4.1 build 20E252 is the official RTM build of iOS 16.4.1, which was released to the public on 7 April 2023.

Fixes and improvements

 * Fixed an issue where Siri may not respond in some cases.
 * Fixed the pushing hands emoji to properly display skin tone variations.
 * Patched existing vulnerabilities with WebKit (CVE-2023-28205) and IOSurfaceAccelerator (CVE-2023-28206).