chore(deps): update terraform datadog to v4

Author: renovate[bot]

src/versions.tf

@@ -8,7 +8,7 @@ terraform {
     }
     datadog = {
       source  = "datadog/datadog"
-      version = ">= 3.3.0, < 4.0.0"
+      version = "< 5.0.0"
     }
   }
 }