Migrate bootable/recovery to androidx.test

See go/jetpack-test-android-migration

Test: make checkbuild
Change-Id: I0740a2205e6b3893ba292cd841592ea85071eefb
diff --git a/updater_sample/tests/AndroidManifest.xml b/updater_sample/tests/AndroidManifest.xml
index 76af5f1..a2da3f7 100644
--- a/updater_sample/tests/AndroidManifest.xml
+++ b/updater_sample/tests/AndroidManifest.xml
@@ -26,7 +26,7 @@
         <uses-library android:name="android.test.runner" />
     </application>
 
-    <instrumentation android:name="android.support.test.runner.AndroidJUnitRunner"
+    <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
                      android:targetPackage="com.example.android.systemupdatersample"
                      android:label="Tests for SystemUpdaterSample."/>