[Fix] pin raft dependent to rapidsai (#299)

Authors:
  - rhdong (https://github.com/rhdong)

Approvers:
  - Bradley Dice (https://github.com/bdice)

URL: #299

Author: rhdong

cpp/cmake/thirdparty/get_raft.cmake

@@ -61,8 +61,8 @@ endfunction()
 # To use a different RAFT locally, set the CMake variable
 # CPM_raft_SOURCE=/path/to/local/raft
 find_and_configure_raft(VERSION  ${RAFT_VERSION}.00
-        FORK                     rhdong
-        PINNED_TAG               half_knn
+        FORK                     ${RAFT_FORK}
+        PINNED_TAG               ${RAFT_PINNED_TAG}
         ENABLE_MNMG_DEPENDENCIES OFF
         ENABLE_NVTX              OFF
         USE_RAFT_STATIC ${CUVS_USE_RAFT_STATIC}