* [CI] Drop CUDA 10.1; Require 11.0 * Change NCCL version * Use CUDA 10.1 for clang-tidy, for now * Remove JDK 11 and 12 * Fix NCCL version * Don't require 11.0 just yet, until clang-tidy is fixed * Skip MultiClassesSerializationTest.GpuHist
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