[identity] Update AWS SDK to match comm-lib

Summary:
Before we can use comm-lib in Identity, we need to update AWS SDK version to match comm-lib.
Hopefully, only breaking changes are in the import paths so updated them and it works.

Depends on D10444

Test Plan: Identity compiles, tests pass

Reviewers: varun, michal

Reviewed By: michal

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10445