Fix deprecation warning when minimum deployment version is iOS 13+ (#8162)

(Note that failing test is expected for external prs (#7476).)

Crashlytics/CHANGELOG.md

@@ -1,6 +1,7 @@
 # Unreleased
 - [changed] Incorporated code quality changes around integer overflow, potential race conditions, and reinstalling signal handlers.
 - [fixed] Fixed an issue where iOS-only apps running on iPads would report iOS as their OS Name.
+- [fixed] Fixed depcrecation warning for projects with minimum deployment version iOS 13 and up.
 
 # v8.0.0
 - [changed] Added a warning to upload-symbols when it detects a dSYM with hidden symbols.

Crashlytics/Crashlytics/Components/FIRCLSApplication.m

@@ -56,7 +56,7 @@ NSString* FIRCLSApplicationGetFirebasePlatform(void) {
 
 #if TARGET_OS_IOS
   if ([firebasePlatform isEqualToString:@"ios"] &&
-      UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
+      [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
     return @"ipados";
   }
   // This check is necessary because iOS-only apps running on iPad