Update git submodules

• Update extensions/ParserFunctions from branch 'REL1_31' to a28ad04eeefa05a16264e67537ba118bd67576d4
  • Fix E_WARNING with {{#pos:}} if the offset is larger than the string
    
    The mb_strpos() function throws E_WARNING if the offset is longer than the length of the string.
    
    Bug: T209600 Change-Id: Ib4296ba136eaf5c8461681e9d5f108118b2494f4 (cherry picked from commit cf1480cb9629514dd4400b1b83283ae6c83ff163)