Fix cron build failure (#6303)

Author: paulb777

FirebaseRemoteConfig/Tests/Sample/Podfile

@@ -1,14 +1,20 @@
 # Uncomment the next line to define a global platform for your project
 # platform :ios, '9.0'
 
+source 'https://github.com/firebase/SpecsStaging.git'
+source 'https://cdn.cocoapods.org/'
+
 target 'RemoteConfigSampleApp' do
   # Comment the next line if you don't want to use dynamic frameworks
   use_frameworks!
   pod 'FirebaseAnalytics'
   pod 'FirebaseCore', :path => '../../../'
+  pod 'FirebaseCoreDiagnostics', :path => '../../../'
   pod 'FirebaseInstallations', :path => '../../../'
   pod 'FirebaseRemoteConfig', :path => '../../../'
   pod 'FirebaseABTesting', :path => '../../..'
+  pod 'GoogleDataTransport', :path => '../../..'
+  pod 'GoogleUtilities', :path => '../../..'
 
   # Pods for RemoteConfigSampleApp