Update Terraform provider versions and hashes in multiple examples

- Upgraded AWS provider from version 6.22.1 to 6.35.1 in external-managed-ssm-secrets, multi-runner, and prebuilt examples.
- Updated local provider from version 2.6.1 to 2.7.0 in the same examples.
- Increased random provider version from 3.7.2 to 3.8.1 across all examples.
- Updated provider hashes to reflect the new versions for AWS, local, and random providers.

Author: Brend-Smits