bump switchman version

fixes CNVS-13611

test plan: run with_each_shard tasks, such as
Reporting::CountsReport.process. It should complete without error. To
fully test the fix, you'd need to do this in an environment that has
many shards.

Change-Id: I425e8c8fb352aba15d0e9bc87b74984d4b7b8900
Reviewed-on: https://gerrit.instructure.com/40487
Reviewed-by: Cody Cutrer <cody@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>