bump moodle2cc version to 0.2.12

refs #CNVS-11945 #CNVS-13362

Change-Id: Ibb6fc7d27cb866caec8ade19c5dc9016273b6d5d
Reviewed-on: https://gerrit.instructure.com/37630
Reviewed-by: Nathan Mills <nathanm@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>