Apply AGP update to 8.1.2.

Android Studio suggested configuration changes after applying !317.

build.gradle.kts

@@ -13,7 +13,7 @@ buildscript {
   val navVersion: String by extra
 
   dependencies {
-    classpath("com.android.tools.build:gradle:8.1.1")
+    classpath("com.android.tools.build:gradle:8.1.2")
     classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.20")
     classpath("com.github.bjoernq:unmockplugin:0.7.9")
     classpath("com.github.ben-manes:gradle-versions-plugin:0.46.0")