Bump robolectric from 4.1 to 4.5.1

Bumps [robolectric](https://github.com/robolectric/robolectric) from 4.1 to 4.5.1.
- [Release notes](https://github.com/robolectric/robolectric/releases)
- [Commits](robolectric/robolectric@robolectric-4.1...robolectric-4.5.1)

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

app/build.gradle

@@ -119,7 +119,7 @@ dependencies {
 
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.mockito:mockito-core:1.+'
-    testImplementation 'org.robolectric:robolectric:4.1'
+    testImplementation 'org.robolectric:robolectric:4.5.1'
 }
 
 apply plugin: 'com.google.gms.google-services'