Updated mediawiki/extensions
Project: mediawiki/extensions/EventLogging  a39e95dcdcd97f41063009ea0286729224b94cbf
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Use SCIDs to reference schema.

Although we can designate a particular schema using a revision ID alone,
I'd like to standardize the use of SCIDs (or schema IDs), because they
are comprehensible to both humans and machines.

Change-Id: Ie40690a81818706954d8025269d7f0bae232f7c4