chore(deps): update terraform aws to v6.21.0

Author: renovate[bot]

terraform/versions.tf

@@ -8,7 +8,7 @@ terraform {
     }
     aws = {
       source  = "hashicorp/aws"
-      version = "6.18.0"
+      version = "6.21.0"
     }
   }
 }