Update hashicorp/aws requirement from ~> 4.9 to ~> 6.18

Updates the requirements on [hashicorp/aws](https://github.com/hashicorp/terraform-provider-aws) to permit the latest version.
- [Release notes](https://github.com/hashicorp/terraform-provider-aws/releases)
- [Changelog](https://github.com/hashicorp/terraform-provider-aws/blob/main/CHANGELOG.md)
- [Commits](hashicorp/terraform-provider-aws@v4.9.0...v6.18.0)

---
updated-dependencies:
- dependency-name: hashicorp/aws
  dependency-version: 6.18.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/basic_usage/versions.tf

@@ -14,7 +14,7 @@ terraform {
     # for more information about the S3 bucket refactor.
     aws = {
       source  = "hashicorp/aws"
-      version = "~> 4.9"
+      version = "~> 6.18"
     }
   }