test: synced androidx gradle versions to the same version as the android test (#959)

test/androidx/app/build.gradle

@@ -55,3 +55,6 @@ dependencies {
         exclude group: 'androidx.test.espresso', module: 'androidx.annotation'
     })
 }
+repositories {
+    jcenter()
+}

test/androidx/build.gradle

@@ -28,7 +28,7 @@ buildscript {
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
 
-        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath 'com.android.tools.build:gradle:3.5.3'
     }
 }
 

test/androidx/wrapper.gradle

@@ -17,5 +17,5 @@
 */
 
 wrapper {
-    gradleVersion = '4.10.3'
+    gradleVersion = '6.1'
 }