[jvm-packages] Add missing commons-lang3 dependency to xgboost4j-gpu

[hcho3]

The CI broke at the trunk branch with error

[ERROR] /workspace/jvm-packages/xgboost4j-gpu/src/test/java/ml/dmlc/xgboost4j/gpu/java/DMatrixTest.java:[27,31] package org.apache.commons.lang does not exist
[ERROR] /workspace/jvm-packages/xgboost4j-gpu/src/test/java/ml/dmlc/xgboost4j/gpu/java/DMatrixTest.java:[122,59] cannot find symbol
symbol: variable ArrayUtils
location: class ml.dmlc.xgboost4j.gpu.java.DMatrixTest

(https://buildkite.com/xgboost/xgboost-ci/builds/819#0184cc80-908c-4e39-9c79-1f56976d2692)

Fix. Specify commons-lang3 package as an explicit dependency of xgboost4j-gpu.

[hcho3]

@wbo4958 Can I get a review?

[wbo4958]

LGTM