Updated mediawiki/extensions
Project: mediawiki/extensions/Math  48461d0fca829cf1037dc5330eba89ff899a93cf

Check if media wiki core is capable of xml type checking

* new test for XML type checking function
* check if StrigUtils::isUtf8 exists in core (Thanks to Deyan Ginev for the hint.)

Bug: 50884
Change-Id: I86af95cbecc4b5c9c33fcd3a66a7fb2ccdde0194