terraform/aws: Constrain the maximum provider version

v6 was recently released. v5.93.0 is what I've tested.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

Author: chucklever

terraform/aws/provider.tf

@@ -7,7 +7,7 @@ terraform {
     }
     aws = {
       source  = "hashicorp/aws"
-      version = "~>5"
+      version = "~> 5.93.0"
     }
   }
 }