[terraform] Deploy Tunnelbroker 0.18-amqp to staging

Summary:
Tunnelbroker image containing fixes from D13595.
Would be good to test them on staging.

Test Plan: terraform plan

Reviewers: ashoat, will, varun, kamil

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13596