chore(deps): update terraform hashicorp/terraform to ~> 0.15.0

Author: renovate-bot

versions.tf

@@ -13,5 +13,5 @@ terraform {
       source = "hashicorp/random"
     }
   }
-  required_version = "~> 0.13"
+  required_version = "~> 0.15.0"
 }