Bump nccl from 2.7.3 to 2.8.3 (#3875)

Former-commit-id: 9ee54b08

cmake/third_party/nccl.cmake

@@ -3,7 +3,7 @@ include (ExternalProject)
 set(NCCL_INCLUDE_DIR ${THIRD_PARTY_DIR}/nccl/include)
 set(NCCL_LIBRARY_DIR ${THIRD_PARTY_DIR}/nccl/lib)
 
-set(NCCL_URL https://github.com/NVIDIA/nccl/archive/v2.7.3-1.tar.gz)
+set(NCCL_URL https://github.com/NVIDIA/nccl/archive/v2.8.3-1.tar.gz)
 use_mirror(VARIABLE NCCL_URL URL ${NCCL_URL})
 set(NCCL_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR}/nccl/src/nccl/build)
 
@@ -34,7 +34,7 @@ ProcessorCount(PROC_NUM)
 ExternalProject_Add(nccl
     PREFIX nccl
     URL ${NCCL_URL}
-    URL_MD5 eafb73aeff4832247648e6237c7c192c
+    URL_MD5 0dfa6079a4bded866fa0f94281c58581
     UPDATE_COMMAND ""
     CONFIGURE_COMMAND ""
     BUILD_IN_SOURCE 1