Updated mediawiki/extensions
Project: mediawiki/extensions/EventLogging  a8602c1d879f30d75b734b8d7da8c6e32c941feb

Validate schemas just once, upon retrieval

Schemas are validated upon being fetched, so there's no need to re-validate on
each incoming event.

Change-Id: I54dbed16d3c18604db47837bb7cc8b9047d2dbf2