Migrate packages/providers/BlockedNumberProvider to androidx.test

See go/jetpack-test-android-migration

Test: mmma packages/providers/BlockedNumberProvider
Change-Id: Ie84841f282f1092403235bea19c2e082e83b9274
diff --git a/tests/AndroidTest.xml b/tests/AndroidTest.xml
index deec903..b9d5ebe 100644
--- a/tests/AndroidTest.xml
+++ b/tests/AndroidTest.xml
@@ -22,7 +22,7 @@
     <option name="test-tag" value="BlockedNumberProviderTest" />
     <test class="com.android.tradefed.testtype.AndroidJUnitTest" >
         <option name="package" value="com.android.providers.blockednumber.tests" />
-        <option name="runner" value="android.support.test.runner.AndroidJUnitRunner" />
+        <option name="runner" value="androidx.test.runner.AndroidJUnitRunner" />
         <option name="hidden-api-checks" value="false"/>
     </test>
 </configuration>