Update cuco version. (#592)

This PR updates the commit hash for cuCollections to include the changes in NVIDIA/cuCollections#138. cudf depends on those changes in 22.04, and some of our CI builds of cudf are finding the version of cuco installed by raft and then failing, so I'm making this change to 22.04 even though we're in code freeze. Happy to work with ops an an alternate solution if there are concerns about the update, though.

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - Corey J. Nolet (https://github.com/cjnolet)

URL: #592

cpp/cmake/thirdparty/get_cuco.cmake

@@ -23,7 +23,7 @@ function(find_and_configure_cuco VERSION)
           INSTALL_EXPORT_SET  raft-exports
           CPM_ARGS
             GIT_REPOSITORY https://github.com/NVIDIA/cuCollections.git
-            GIT_TAG        0ca860b824f5dc22cf8a41f09912e62e11f07d82
+            GIT_TAG        6ec8b6dcdeceea07ab4456d32461a05c18864411
             OPTIONS        "BUILD_TESTS OFF"
                            "BUILD_BENCHMARKS OFF"
                            "BUILD_EXAMPLES OFF"