Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  dc9334a251f1f042e138497b07052b1bf4106592

Default numchanges for selser tests to 20

* Updated blacklist to account for new tests added since #50316
* Fixed bug introduced in #50316 that falsely reported duplicate changes 
  as passing.

Change-Id: If09af1d5acb702c712237e1a01237e0eee190177