[jvm-packages] XGBoost4J-Spark 2.0.0-RC1 fails for Spark 3.4.0 on EMR

Hello everybody,

I am trying to implement XGBoost4J-Spark in a scala project. Everything works fine locally (on an intel MacBook), however when deploying to EMR, I receive the following error (running on EMR 6.12.0 and Spark 3.4.0 with Scala 2.12.17):
```
java.lang.NoClassDefFoundError: Could not initialize class ml.dmlc.xgboost4j.java.XGBoostJNI
```

For my `build.sbt` I added the following lines to `libraryDependencies`, as suggested by the tutorial (running with sbt 1.9.2):
```
"ml.dmlc" %% "xgboost4j" % "1.7.6",
"ml.dmlc" %% "xgboost4j-spark" % "1.7.6"
```
I packaged everything up into a single JAR via the `sbt-assembly` plugin. I believe that this would pack all the dependencies into the JAR that is needed to run the Spark Application on EMR, so I am really out of ideas about this error. Not sure if this is an error on my end or an actual bug. Help is appreciated!