Bump espresso-core from 3.1.0-beta01 to 3.1.0-beta02 (#1047)

Bumps espresso-core from 3.1.0-beta01 to 3.1.0-beta02.

Signed-off-by: dependabot[bot] <support@dependabot.com>

mobile/build.gradle

@@ -145,7 +145,7 @@ dependencies {
     testImplementation 'org.powermock:powermock-module-junit4:1.7.4'
 
     // Espresso UI tests
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-beta01', {
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-beta02', {
         exclude group: 'com.android.support', module: 'support-annotations'
     }
     androidTestImplementation 'androidx.test:runner:1.1.0-beta01'