Rewrite based on code from the GitHub Dependency Graph Gradle Plugin

fixtures/settings/dependency-resolution-management/kotlin/settings.gradle.kts

@@ -1,6 +1,6 @@
 dependencyResolutionManagement {
     repositories {
-        maven { url = uri("http://localhost:9999") }
+        maven { url = uri(System.getProperty("org.nixos.gradle2nix.m2")) }
     }
     repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS)
-}
+}