Update build.gradle.kts to use Java 21 and Kotlin 21

Author: rfc2822

sample-app/build.gradle.kts

@@ -16,33 +16,28 @@ android {
         minSdk = 21
         targetSdk = 35
 
-        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables {
             useSupportLibrary = true
         }
     }
 
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_21
+        targetCompatibility = JavaVersion.VERSION_21
+    }
+    kotlin {
+        jvmToolchain(21)
+    }
+
     buildTypes {
         release {
-            isMinifyEnabled = false
             proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"))
         }
     }
-    compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
-    }
-    kotlinOptions {
-        jvmTarget = "1.8"
-    }
+
     buildFeatures {
         compose = true
     }
-    packaging {
-        resources {
-            excludes.add("/META-INF/{AL2.0,LGPL2.1}")
-        }
-    }
 }
 
 dependencies {