update hairtrigger

so it doesn't puke on newer rubies

Change-Id: I10524adc76478e7908d843c2936b91b795b9ab71
Reviewed-on: https://gerrit.instructure.com/36721
Reviewed-by: Rob Orton <rob@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>