Update development documentation about Static code analysis plugin to use (FindBugs is dead)

FindBugs is referenced to help developers. The FindBugs project is dead since 2015.

The successor is https://spotbugs.github.io/

Another Static code analysis program is SonarLint which can be bind with Sonarcloud.io.

Would be nice to update the development documentation to suggest using a more up-to-date tooling
(personal preference is SonarLint)