Update git submodules

* Update extensions/RevisionSlider from branch 'wmf/1.33.0-wmf.4'
  to 553082466922f08560972e40fedc70f81e09a830
  - Fix (accidentally?) reversed blue and yellow lines
    
    This reverts parts of the patch I4d8db23 (T162119) that have
    accidentally been done, as far as I can tell.
    
    Note the revert in this patch here is untested and might partly break
    the keyboard navigation feature introduced via T162119. However, I
    strongly suggest to fix the bug T208238 first, and look back at
    T162119 later, possibly via a newly created ticket.
    
    Bug: T162119
    Bug: T208238
    Change-Id: I0c03e472b72ddd1414d3ca61970dba15158a8486
    (cherry picked from commit e227de5a48f1328a539b417d3c55e3688746af79)
    
1 file changed