jcenter() is being shut down

[GregVes]

Hello,

As you might know jcenter() is being shut down and it is recommended to move Java artifacts to maven.

Check out what might be done for your package: https://github.com/matomo-org/matomo-sdk-android/issues/301#issuecomment-850963007

It would be great if you could proceed to this change as gradle builds fail when it tries to fetch org.matomo.sdk:tracker:4.0.1