[Release] Update versions for 12.9.0 (#15714)

FirebaseInstallations.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseInstallations'
-  s.version          = '12.8.0'
+  s.version          = '12.9.0'
   s.summary          = 'Firebase Installations'
 
   s.description      = <<-DESC
@@ -45,7 +45,7 @@ Pod::Spec.new do |s|
   }
 
   s.framework = 'Security'
-  s.dependency 'FirebaseCore', '~> 12.8.0'
+  s.dependency 'FirebaseCore', '~> 12.9.0'
   s.dependency 'PromisesObjC', '~> 2.4'
   s.dependency 'GoogleUtilities/Environment', '~> 8.1'
   s.dependency 'GoogleUtilities/UserDefaults', '~> 8.1'