[backport] [CI] Require C++17 + CMake 3.18; Use CUDA 11.8 in CI (#8853) (#8971)

Co-authored-by: Philip Hyunsu Cho <chohyu01@cs.washington.edu>

tests/python-gpu/test_gpu_prediction.py

@@ -216,6 +216,7 @@ class TestGPUPredict:
     def test_inplace_predict_cupy(self):
         self.run_inplace_predict_cupy(0)
 
+    @pytest.mark.xfail
     @pytest.mark.skipif(**tm.no_cupy())
     @pytest.mark.mgpu
     def test_inplace_predict_cupy_specified_device(self):