Add bug link for dackka exposing the configuration

Author: daymxn

buildSrc/src/main/java/com/google/firebase/gradle/plugins/FiresiteTransformTask.kt

@@ -98,7 +98,7 @@ abstract class FiresiteTransformTask : DefaultTask() {
      * --> "firebase.appcheck"
      * ```
      */
-    // TODO(b/): Remove when dackka exposes configuration for this
+    // TODO(b/257293594): Remove when dackka exposes configuration for this
     private fun String.removeGoogleGroupId() =
         remove(Regex("(?<=\")com.google.(?=firebase.)"))