Bump rules from 1.3.0 to 1.4.0 (#198)

Bumps rules from 1.3.0 to 1.4.0.

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

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notification-hubs-sdk/build.gradle

@@ -78,7 +78,7 @@ dependencies {
     androidTestImplementation 'androidx.test:core:1.3.0'
     androidTestImplementation 'androidx.test:runner:1.3.0'
     androidTestUtil 'androidx.test:orchestrator:1.3.0'
-    androidTestImplementation 'androidx.test:rules:1.3.0'
+    androidTestImplementation 'androidx.test:rules:1.4.0'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
 
     testImplementation 'androidx.test:core:1.3.0'