[terraform] bump prod identity to 0.40

Summary: This bumps prod identity to 0.40

Test Plan: Upgrading prod identity to verison 0.40. Currently testing on staging. Will land later in the evening

Reviewers: varun, ashoat

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13598

services/terraform/remote/service_identity.tf

@@ -1,5 +1,5 @@
 locals {
-  identity_service_image_tag      = local.is_staging ? "0.40" : "0.39"
+  identity_service_image_tag      = local.is_staging ? "0.40" : "0.40"
   identity_service_server_image   = "commapp/identity-server:${local.identity_service_image_tag}"
   identity_service_container_name = "identity-server"