Bump androidx.test.ext:truth from 1.4.0 to 1.6.0 in /android (#197)

Bumps androidx.test.ext:truth from 1.4.0 to 1.6.0.

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

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Author: dependabot[bot]

android/releasetest/build.gradle

@@ -92,7 +92,7 @@ dependencies {
     androidTestImplementation "androidx.test:runner:1.4.0"
 
     androidTestImplementation "androidx.test.ext:junit:1.1.4"
-    androidTestImplementation "androidx.test.ext:truth:1.4.0"
+    androidTestImplementation "androidx.test.ext:truth:1.6.0"
     androidTestImplementation('org.awaitility:awaitility:4.2.2') {
         transitive = false
     }