Updated mediawiki/extensions
Project: mediawiki/extensions/RSS  aec87de507deed5691de02fcb31f3ca57bc1e428

Follow-up I7d4bb9062. Register tracking category used.

This allows rss-tracking-category to appear in the newly added
[[Special:TrackingCategories]].

Bug: 63286
Change-Id: I9d37c37f14b29dfb4377a13d4d799f93a7c7d22e