Migrate packages/apps/Contacts to androidx.test

See go/jetpack-test-android-migration

Test: make checkbuild
Change-Id: I0abad7618ac496561f6fb07da2590c79f82a2024
diff --git a/tests/Android.mk b/tests/Android.mk
index dfea843..ce4e6ad 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -18,7 +18,7 @@
 LOCAL_MIN_SDK_VERSION := 21
 
 LOCAL_STATIC_JAVA_LIBRARIES += \
-    android-support-test \
+    androidx.test.rules \
     hamcrest-library \
     mockito-target-minus-junit4 \
     ub-uiautomator