Declare dependency on copyFlutterAssetsTask in bundleAarTask (#137370)

Fixes https://github.com/flutter/flutter/issues/129471.

Does so by doing a very similar thing that is done by https://github.com/flutter/flutter/pull/121958, but for a task that is specific to the add to app build process.

packages/flutter_tools/gradle/src/main/groovy/flutter.groovy

@@ -1130,12 +1130,19 @@ class FlutterPlugin implements Plugin<Project> {
                     variantOutput.processResourcesProvider.get() : variantOutput.processResources
                 processResources.dependsOn(copyFlutterAssetsTask)
             }
-            // Task compressAssets uses the output of copyFlutterAssetsTask,
-            // so it's necessary to declare it as an dependency.
+            // The following tasks use the output of copyFlutterAssetsTask,
+            // so it's necessary to declare it as an dependency since Gradle 8.
+            // See https://docs.gradle.org/8.1/userguide/validation_problems.html#implicit_dependency.
             def compressAssetsTask = project.tasks.findByName("compress${variant.name.capitalize()}Assets")
             if (compressAssetsTask) {
                 compressAssetsTask.dependsOn copyFlutterAssetsTask
             }
+
+            def bundleAarTask = project.tasks.findByName("bundle${variant.name.capitalize()}Aar")
+            if (bundleAarTask) {
+                bundleAarTask.dependsOn copyFlutterAssetsTask
+            }
+
             return copyFlutterAssetsTask
         } // end def addFlutterDeps