Summary: [ENG-11216](https://linear.app/comm/issue/ENG-11222/increase-tunnelbroker-instances-5-for-launch)

Test Plan: Terraform plan, @bartek is going to make a deploy later today, so we're going to test it on prod

Reviewers: bartek

Reviewed By: bartek

Subscribers: ashoat, tomek, bartek

Differential Revision: https://phab.comm.dev/D15327