build(deps): bump robolectric from 4.5.1 to 4.6 in /app (#4084)

Bumps [robolectric](https://github.com/robolectric/robolectric) from 4.5.1 to 4.6.
- [Release notes](https://github.com/robolectric/robolectric/releases)
- [Commits](robolectric/robolectric@robolectric-4.5.1...robolectric-4.6)

---
updated-dependencies:
- dependency-name: org.robolectric:robolectric
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

app/build.gradle.kts

@@ -172,7 +172,7 @@ dependencies {
 
     // Unit Testing
     testImplementation("junit:junit:4.13.2")
-    testImplementation("org.robolectric:robolectric:4.5.1")
+    testImplementation("org.robolectric:robolectric:4.6")
     testImplementation("org.mockito:mockito-core:3.11.2")
     testImplementation("net.javacrumbs.json-unit:json-unit-fluent:2.27.0")
     testImplementation("com.google.truth:truth:1.1.3")