modified url for app engine test-app (#10113)

Co-authored-by: Parijat Bhatt <parijatbhatt@google.com>

FirebaseAuth/Tests/Sample/E2eTests/BYOAuthTests.m

@@ -17,7 +17,7 @@
 #import "FIRAuthE2eTestsBase.h"
 
 /** The url for obtaining a valid custom token string used to test BYOAuth. */
-static NSString *const kCustomTokenUrl = @"https://fb-sa-1211.appspot.com/token";
+static NSString *const kCustomTokenUrl = @"https://gcip-testapps.wl.r.appspot.com/token";
 
 /** The invalid custom token string for testing BYOAuth. */
 static NSString *const kInvalidCustomToken = @"invalid token.";

FirebaseAuth/Tests/Sample/Sample/MainViewController+AutoTests.m

@@ -34,9 +34,9 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-static NSString *const kCustomTokenUrl = @"https://fb-sa-1211.appspot.com/token";
+static NSString *const kCustomTokenUrl = @"https://gcip-testapps.wl.r.appspot.com/token";
 
-static NSString *const kExpiredCustomTokenUrl = @"https://fb-sa-1211.appspot.com/expired_token";
+static NSString *const kExpiredCustomTokenUrl = @"https://gcip-testapps.wl.r.appspot.com/expired_token";
 
 static NSString *const kInvalidCustomToken = @"invalid custom token.";