bump moodle2cc gem version to 0.2.7

fixes #CNVS-7538 #CNVS-12861 #CNVS-12862 #CNVS-12863 #CNVS-12864 #CNVS-12887

Change-Id: Idcfb3fc2ef895446dcaece594a3d72059623bb0c
Reviewed-on: https://gerrit.instructure.com/34603
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Nathan Mills <nathanm@instructure.com>
QA-Review: Nathan Rogowski <nathan@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>