[jvm-packages] xgboost-jvm metapackage is not suffixed with Scala version

[hcho3]

In past versions, the top-level metapackage xgboost-jvm was always suffixed with Scala version.
For example, from https://repo1.maven.org/maven2/ml/dmlc/xgboost-jvm_2.12/ :

However, the latest XGBoost (2.0.1) does not have the suffix:

As a result, downstream projects may not be able to correctly locate artifacts for a given Scala version. Now that we want to distribute XGBoost JARs for both Scala 2.12 and Scala 2.13, the issue is quite critical.

I am preparing a new patch release 2.0.2 to fix this issue.

[hcho3]

XGBoost 2.0.2 is now available on Maven Central:

https://repo1.maven.org/maven2/ml/dmlc/xgboost-jvm_2.12/2.0.2/
https://repo1.maven.org/maven2/ml/dmlc/xgboost-jvm_2.13/2.0.2/
https://repo1.maven.org/maven2/ml/dmlc/xgboost4j_2.12/2.0.2/
https://repo1.maven.org/maven2/ml/dmlc/xgboost4j_2.13/2.0.2/