chore: upgrade to Aspect Worklfows 5.9.9 (#1484)

Author: gregmagolan

.aspect/workflows/terraform/workflows.tf

@@ -16,7 +16,7 @@ module "aspect_workflows" {
   region  = local.region
 
   # Aspect Workflows terraform module
-  source = "https://s3.us-east-2.amazonaws.com/static.aspect.build/aspect/5.9.5/terraform-gcp-aspect-workflows.zip"
+  source = "https://s3.us-east-2.amazonaws.com/static.aspect.build/aspect/5.9.9/terraform-gcp-aspect-workflows.zip"
 
   # Network properties
   network    = google_compute_network.workflows_network.id