[terraform] Upgrade AWS Terraform provider to 5.32.0

Summary:
AWS Elasticache serverless requires AWS provider version 5.32.0 or above.

Depends on D12339

Test Plan: Successful terraform apply

Reviewers: varun, bartek

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12457