[terraform] bump prod identity to 0.35

Summary:
we probably can't deploy this until monday at this point, but preparing the diff now so that we're not blocked on getting it approved later.

confirmed that @Ashoat tagged and pushed 0.35 to dockerhub after the apparent issues pushing 0.35-staging to dockerhub yesterday.

won't land until we're ready to deploy

Test Plan: terraform plan

Reviewers: will, ashoat, bartek

Reviewed By: will

Subscribers: tomek, ashoat

Differential Revision: https://phab.comm.dev/D13252

services/terraform/remote/service_identity.tf

@@ -1,5 +1,5 @@
 locals {
-  identity_service_image_tag      = local.is_staging ? "0.35-staging" : "0.34"
+  identity_service_image_tag      = local.is_staging ? "0.35-staging" : "0.35"
   identity_service_server_image   = "commapp/identity-server:${local.identity_service_image_tag}"
   identity_service_container_name = "identity-server"