Bump switchman

Change-Id: I2c82c7514d067dde79ebb2b8a737b6f26ef3498f
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/287715

Reviewed-by: Aaron Ogata <aogata@instructure.com>
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
QA-Review: Jacob Burroughs <jburroughs@instructure.com>
Product-Review: Jacob Burroughs <jburroughs@instructure.com>

Gemfile.d/app.rb

@@ -36,7 +36,7 @@ if CANVAS_RAILS6_0
 else
   gem "rails", "6.1.4.6"
     gem "tzinfo", "2.0.4"
-  gem_override "switchman", "3.0.11"
+  gem_override "switchman", "3.0.12"
     gem "guardrail", "3.0.0"
   gem_override "switchman-inst-jobs", "4.0.6"
 end