Keychain: use kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly instead of deprecated since iOS 13 kSecAttrAccessibleAlwaysThisDeviceOnly. (#4169)

Author: maksymmalyhin

FirebaseInstallations/Source/Library/SecureStorage/FIRInstallationsKeychainUtils.m

@@ -62,7 +62,7 @@ + (BOOL)setItem:(NSData *)item
 
   NSMutableDictionary *mutableQuery = [query mutableCopy];
   mutableQuery[(__bridge id)kSecAttrAccessible] =
-      (__bridge id)kSecAttrAccessibleAlwaysThisDeviceOnly;
+      (__bridge id)kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly;
 
   OSStatus status;
   if (!existingItem) {