bump switchman and shackles

Change-Id: I0377060ca611840cce34c6dc03b4c2c7d631d952
Reviewed-on: https://gerrit.instructure.com/33877
Reviewed-by: Jacob Fugal <jacob@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>