Gradle: Update to version 5.2

[czirkelbach]

For the next release we should update our multiprojects and update them to be based on Gradle version 5.2. Related to ExplorViz-Archive/explorviz-backend-shared#1.

[Alexander-Krause-Glau]

I am experiencing issues with the compileJava task for the latest Gradle version 5.2.1. For example, we use the dependency user, i.e., the subproject of our shared-multi-project, in our authentication service. user uses the dependency xyz.morphia.morphia and authentication uses the same dependency.

Prior to 5.2.1 this was no problem since Gradle used the transitive dependency, i.e.,

authentication -> user -> morphia => authentication -> morphia.

I can see that this dependency is in fact downloaded and used in Eclipse, but not for the gradle compileJava task. Therefore, Eclipse does not show any error, but the gradle build fails.

I created a new branch gradle-update with gradle-wrapper version 5.2.1 so that @czirkelbach and @lotzk can verify if they have the same problem.

[Alexander-Krause-Glau]

Fixed with ExplorViz-Archive/explorviz-backend-shared@522ef24