undo bump in extension pod

FirebaseCoreExtension.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name             = 'FirebaseCoreExtension'
-    s.version          = '11.4.2'
+    s.version          = '11.4.1'
     s.summary          = 'Extended FirebaseCore APIs for Firebase product SDKs'
 
     s.description      = <<-DESC