Update git submodules

• Update extensions/Math from branch 'REL1_43' to 1fa6908c540f83d4a4d0ff3f4f74b04e5e7b08f2
  • Add changes test
    
    The native Math rendering mode is transitioning into a more stable state. To avoid regression, we start adding changes test to avoid unintended side effects for modifications made. The maintenance script provides a mechanism, to easily update the references after manual review.
    
    When creating the *unit* tests it was required to move forward with refactoring the code to better support the concept of services. Thus new service injection was added to make the code testable by unit code without to disable the old entry paths.
    
    The newly introduced property, rawError is a workaround as it calls
    
    \MediaWiki\Message\Message::fetchMessage
    
    which relies on MediaWikiServices to be present.
    
    Bug: T386071 Change-Id: I52c1b23194dda41a85e28d436a62d34a19154783 (cherry picked from commit 1916e4cf21ce6944ab99d241508bc128fbfa3f84)