[terraform] Bump staging Identity to 0.48

Summary:
Git log 0.47 - 0.48:

• c44920a6ca [identity] Optimize Tunnelbroker device data removal
• 6fd253e5bc [identity] Force v1 primary logout for authoritative keyserver owner
• 58bf345631 [identity] Allow v1 login for authoritative keyserver
• efd40b9457 [identity] Verify new flow migration device list update
• cedacdf005 [identity] Reset device list and services data during password reset
• 3121657991 [identity] Update V1 logout to handle new flow users
• d91394b8f1 [identity] Return use_v1_flow in new-flow-only RPCs
• a8129cf7fd [identity] Return use_new_flow in V1 login RPCs
• 8944ea4f6b [identity] Add function to check user login flow
• 88f7830fc5 [identity] Add function to check if user has backup
• 7877d5b110 [identity] Remove outdated comment from constants

Test Plan: terraform plan

Reviewers: kamil, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D14178