FirebaseCore version bump to 6.3.3 (#4213)

Firebase.podspec

@@ -36,7 +36,7 @@ Simplify your iOS development, grow your user base, and monetize more effectivel
   end
 
   s.subspec 'CoreOnly' do |ss|
-    ss.dependency 'FirebaseCore', '6.3.2'
+    ss.dependency 'FirebaseCore', '6.3.3'
     ss.source_files = 'CoreOnly/Sources/Firebase.h'
     ss.preserve_paths = 'CoreOnly/Sources/module.modulemap'
     ss.user_target_xcconfig = {

FirebaseCore.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseCore'
-  s.version          = '6.3.2'
+  s.version          = '6.3.3'
   s.summary          = 'Firebase Core for iOS (plus community support for macOS and tvOS)'
 
   s.description      = <<-DESC