Updated tk-shotgun to v0.11.3

Release notes: https://github.com/shotgunsoftware/tk-shotgun/releases/tag/v0.11.3

Author: toolkitty-app[bot]

env/includes/engine_locations.yml

@@ -68,7 +68,7 @@ engines.tk-shell.location:
 engines.tk-shotgun.location:
   type: app_store
   name: tk-shotgun
-  version: v0.11.2
+  version: v0.11.3
 engines.tk-vred.location:
   type: app_store
   name: tk-vred