BackgroundAssets macOS xcode14.3 beta3

#BackgroundAssets.framework https://github.com/xamarin/xamarin-macios/pull/17810

diff -ruN /Applications/Xcode_14.3.0-beta2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/BackgroundAssets.framework/Headers/BADownloaderExtension.h /Applications/Xcode_14.3.0-beta3.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/BackgroundAssets.framework/Headers/BADownloaderExtension.h
--- /Applications/Xcode_14.3.0-beta2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/BackgroundAssets.framework/Headers/BADownloaderExtension.h	2023-02-25 10:26:16
+++ /Applications/Xcode_14.3.0-beta3.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/BackgroundAssets.framework/Headers/BADownloaderExtension.h	2023-03-09 18:42:06
@@ -63,7 +63,9 @@
 /// This callback provides a last chance to tidy up state before process termination.
 /// @warning This method is advisory only, there will be instances where the extension is terminated before this method is invoked.
 /// Do not rely on this method being invoked before the extension is terminated.
-- (void)extensionWillTerminate;
+- (void)extensionWillTerminate
+API_DEPRECATED("extensionWillTerminate will not be invoked in all applicable circumstances and should not be relied upon.", ios(16.1, 16.4), macos(13.0, 13.3))
+API_UNAVAILABLE(tvos, watchos);
 
 @end