fix update account associations weekly
fix update account associations weekly

refs CNVS-18170

test plan
 - account_associations should update every week
 - you may need to set your clock to before 10 am
   on a Sunday to see that this job gets picked up

Change-Id: Icf34f66ba0803bc84ef314db5045537d8854dccf
Reviewed-on: https://gerrit.instructure.com/84371
Tested-by: Jenkins
Reviewed-by: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
Product-Review: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
QA-Review: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>

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