Bump androidx.test:core from 1.5.0 to 1.6.0 in /android-refimpl-app

Bumps androidx.test:core from 1.5.0 to 1.6.0.

---
updated-dependencies:
- dependency-name: androidx.test:core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

android-refimpl-app/app/build.gradle

@@ -402,13 +402,13 @@ dependencies {
     // ---------------------
     // ---------------------
     // Testing-only dependencies
-    androidTestImplementation 'androidx.test:core:1.5.0'
+    androidTestImplementation 'androidx.test:core:1.6.0'
     androidTestImplementation 'androidx.test.ext:junit:1.2.0'
     androidTestImplementation 'androidx.test:runner:1.5.2'
     androidTestImplementation 'androidx.test:rules:1.5.0'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
     // ---------------------
-    testImplementation 'androidx.test:core:1.5.0'
+    testImplementation 'androidx.test:core:1.6.0'
     testImplementation 'androidx.test.ext:junit:1.2.0'
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.robolectric:robolectric:4.13'