[revert] Update Gradle to 8.13.1

src/android/build.gradle.kts

@@ -1,12 +1,9 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
 // SPDX-FileCopyrightText: 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id("com.android.application") version "8.13.1" apply false
+    id("com.android.application") version "8.9.1" apply false
     id("com.android.library") version "8.1.4" apply false
     id("org.jetbrains.kotlin.android") version "1.9.20" apply false
 }