Fixes a regression in the build (caught by github actions) where the running AndroidTests was failing due to an issue with desugaring:

• What went wrong:
  Execution failed for task ':mvicore-demo:mvicore-demo-feature2:mergeExtDexDebugAndroidTest'.

Could not resolve all files for configuration ':mvicore-demo:mvicore-demo-feature2:debugAndroidTestRuntimeClasspath'.
Failed to transform lifecycle-common-java8-2.2.0.jar (androidx.lifecycle:lifecycle-common-java8:2.2.0) to match attributes {artifactType=android-dex, dexing-enable-desugaring=false, dexing-incremental-transform=false, dexing-is-debuggable=true, dexing-min-sdk=21, org.gradle.category=library, org.gradle.libraryelements=jar, org.gradle.status=release, org.gradle.usage=java-runtime}.
> Execution failed for DexingNoClasspathTransform: /Users/runner/.gradle/caches/modules-2/files-2.1/androidx.lifecycle/lifecycle-common-java8/2.2.0/cd3478503da69b1a7e0319bd2d1389943db9b364/lifecycle-common-java8-2.2.0.jar.
> Error while dexing.
The dependency contains Java 8 bytecode. Please enable desugaring by adding the following to build.gradle
android {
compileOptions {
sourceCompatibility 1.8
targetCompatibility 1.8
}
}
See https://developer.android.com/studio/write/java8-support.html for details. Alternatively, increase the minSdkVersion to 24 or above.