Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  9caba33ab5e399649361383b17517693139e7660

[SCHEMA CHANGE] Add index on revision user data

It's part of Special:Contributions' WHERE-clause 
While this is a schema change, it's non-blocking. We can merge
this whenever, we just have to make sure this is done some day.

Change-Id: Icedaf6b164f920160e6c9b886eb1c32ef0ad802e