Fix Spa test utils

Should dependent on org.mockito:mockito-core instead of dexmaker.

Bug: 284913888
Test: Gradle Sync
Test: Unit test
Change-Id: I71dbd79c474630875f47b74b501de3981ab4fc6c
diff --git a/packages/SettingsLib/Spa/spa/build.gradle.kts b/packages/SettingsLib/Spa/spa/build.gradle.kts
index fac63361..5289635 100644
--- a/packages/SettingsLib/Spa/spa/build.gradle.kts
+++ b/packages/SettingsLib/Spa/spa/build.gradle.kts
@@ -15,8 +15,8 @@
  */
 
 plugins {
-    id(libs.plugins.android.library.get().pluginId)
-    id(libs.plugins.kotlin.android.get().pluginId)
+    alias(libs.plugins.android.library)
+    alias(libs.plugins.kotlin.android)
     jacoco
 }
 
@@ -70,6 +70,7 @@
 
     androidTestImplementation(project(":testutils"))
     androidTestImplementation("androidx.lifecycle:lifecycle-runtime-testing")
+    androidTestImplementation(libs.dexmaker.mockito)
 }
 
 tasks.register<JacocoReport>("coverageReport") {