bump shackles version
bump shackles version

Change-Id: I49c7975259a0cf93ecdfdb5fc56d6f220a0ecb9c
test-plan: N/A
Reviewed-on: https://gerrit.instructure.com/26603
Reviewed-by: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Jacob Fugal <f862f167b85d41b225785c70d70808bc7337c1fe@instructure.com>
Product-Review: Jacob Fugal <f862f167b85d41b225785c70d70808bc7337c1fe@instructure.com>

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