Update android.gradle.plugin to v9

Author: renovate[bot]

gradle/libs.versions.toml

@@ -35,7 +35,7 @@ core-ktx = "1.18.0"
 core-splashscreen = "1.2.0"
 spotless = "8.1.0"
 detekt = "1.23.8"
-android-gradle-plugin = "8.13.2"
+android-gradle-plugin = "9.1.0"
 easylauncher = "6.4.1"
 about-libraries = "13.2.1"