Apply AGP update to 8.1.1.

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:7.4.2")
+    classpath("com.android.tools.build:gradle:8.1.1")
     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")

gradle.properties

@@ -4,3 +4,6 @@ kotlin.code.style=official
 
 android.useAndroidX=true
 android.enableJetifier=true
+android.defaults.buildfeatures.buildconfig=true
+android.nonTransitiveRClass=false
+android.nonFinalResIds=false