Update android.gradle.plugin to v9

Author: renovate[bot]

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ android-minSdk = "23"
 android-targetSdk = "36"
 
 kotlin = "2.2.21"
-android-gradle-plugin = "8.13.1"
+android-gradle-plugin = "9.1.0"
 ksp = "2.3.3"
 spotless = "8.1.0"
 detekt = "1.23.8"