bump encrypted_cookie_store

now allows booting with rails 4

Change-Id: Ieb006a5fc5e005ce8fadc7fd777fc73db927164e
Reviewed-on: https://gerrit.instructure.com/41512
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: James Williams  <jamesw@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>