Update git submodules

• Update AdvancedMeta from branch 'master' to ab2299fac24ba2b824cddac22f9af95b30f02300
  • Add visibility to constants
    
    This extension requires MW 1.36+, which in turn supports PHP 7.3.19 or later, so we can declare the visibility of constants.
    
    Bug: T237840 Change-Id: I6a5b2cf6a084b8db4fb82bfdc79a75db6d3cc7b8