fix: s3 scan object function timeout (#391)

Update to the latest version of the `s3_scan_object` module which
increases the transport lambda function's timeout from 3s to 120s.

This fixes an issue seen in Notify where the transport lambda was
timing out if it had to wait for a Scan Files API function cold start.

aws/app/vault_scan_object.tf

@@ -1,5 +1,5 @@
 module "vault_scan_object" {
-  source = "github.com/cds-snc/terraform-modules?ref=v3.0.13//S3_scan_object"
+  source = "github.com/cds-snc/terraform-modules?ref=v5.1.9//S3_scan_object"
 
   product_name          = "vault"
   s3_upload_bucket_name = aws_s3_bucket.vault_file_storage.id