fix(deps): update terraform hashicorp/terraform to >= 1.15.3

Author: renovate-bot

terraform/infra/versions.tf

@@ -19,7 +19,7 @@ terraform {
       version = ">= 7.16.0"
     }
   }
-  required_version = ">= 1.5"
+  required_version = ">= 1.15.3"
 
   provider_meta "google" {
     module_name = "cloud-solutions/gcs-malware-scanner-deploy-v3.1.0" # x-release-please-version

terraform/service/versions.tf

@@ -23,7 +23,7 @@ terraform {
       version = ">= 3.8.0"
     }
   }
-  required_version = ">= 1.5"
+  required_version = ">= 1.15.3"
 
   provider_meta "google" {
     module_name = "cloud-solutions/gcs-malware-scanner-deploy-v3.1.0" # x-release-please-version