Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  ba0ff2dc9fcf3dd21b60786df795f2688453ea9a

Update cache version number to 4.5

The backend code for sortby recent activity is already collecting
data in production.  Since there was a cache corruption earlier,
we need to purge the cache once the new frontend code is deployed

Change-Id: Iab5f232caccabb99f8783e24aa5ba36126f4f0f6