Migrate external/dexmaker to androidx.test

See go/jetpack-test-android-migration

Test: atest CtsMockingTestCases
Change-Id: I7aeb50a13547e80c53ca8ea213bf49c9c44b800f
Merged-In: Ife356812958e319b37236ddb4f797195bb8d753b
diff --git a/dexmaker-mockito-inline-tests/build.gradle b/dexmaker-mockito-inline-tests/build.gradle
index 8ca3663..c731115 100644
--- a/dexmaker-mockito-inline-tests/build.gradle
+++ b/dexmaker-mockito-inline-tests/build.gradle
@@ -28,7 +28,7 @@
         targetSdkVersion 28
         versionName VERSION_NAME
 
-        testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }
 
     externalNativeBuild {