[terraform] upgrade blob on prod

Summary: Resolves holder issue in https://linear.app/comm/issue/ENG-9462/prod-webapp-blobcommtechnologiesorgholders-status-404

Test Plan: blob 1.2.0 is already running on staging. This deploys 1.2.0 to prod

Reviewers: varun

Reviewed By: varun

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13565