Update CUDA_STANDARD and CXX_STANDARD to 17

This PR updates the `CUDA_STANDARD` and `CXX_STANDARD` properties in CMake to be `17`. This resolves some build issues that are currently occurring in RAPIDS Docker builds.

cmake/Utils.cmake

@@ -170,7 +170,7 @@ function(xgboost_set_cuda_flags target)
   endif (MSVC)
 
   set_target_properties(${target} PROPERTIES
-    CUDA_STANDARD 14
+    CUDA_STANDARD 17
     CUDA_STANDARD_REQUIRED ON
     CUDA_SEPARABLE_COMPILATION OFF)
 endfunction(xgboost_set_cuda_flags)
@@ -190,7 +190,7 @@ endmacro(xgboost_link_nccl)
 # compile options
 macro(xgboost_target_properties target)
   set_target_properties(${target} PROPERTIES
-    CXX_STANDARD 14
+    CXX_STANDARD 17
     CXX_STANDARD_REQUIRED ON
     POSITION_INDEPENDENT_CODE ON)
   if (HIDE_CXX_SYMBOLS)