build(deps): bump com.android.library from 8.12.3 to 9.3.1 in /packages/kotlin/src

packages/kotlin/src/android/build.gradle.kts

@@ -1,11 +1,13 @@
+import com.android.build.api.variant.HostTestBuilder
 import com.vanniktech.maven.publish.AndroidSingleVariantLibrary
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import java.io.FileInputStream
 import java.util.Properties
 
 plugins {
+    // AGP 9+ has built-in Kotlin support; a separate kotlin-android plugin is no
+    // longer applied. See https://issuetracker.google.com/438678642.
     alias(libs.plugins.android.library)
-    alias(libs.plugins.jetbrains.kotlin.android)
     alias(libs.plugins.dokka)
     alias(libs.plugins.mavenPublish)
     `maven-publish`
@@ -81,15 +83,24 @@ kotlin {
     }
 }
 
+// AGP 9 only generates unit-test tasks for the debug variant by default. Our
+// pipeline runs tests against the release variant (matches published artifact),
+// so enable the release host unit-test explicitly.
+androidComponents {
+    beforeVariants(selector().withBuildType("release")) { variantBuilder ->
+        variantBuilder.hostTests[HostTestBuilder.UNIT_TEST_TYPE]?.enable = true
+    }
+}
+
 android {
     namespace = project.group.toString()
-    compileSdk = 34
+    compileSdk = 37
 
     defaultConfig {
         minSdk = 26
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         aarMetadata {
-            minCompileSdk = 34
+            minCompileSdk = 37
         }
     }
 

packages/kotlin/src/gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-agp = "8.12.3"
+agp = "9.3.1"
 kotlin = "2.4.10"
 
 kotlinx-coroutines = "1.11.0"

packages/kotlin/src/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.5.0-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME