Bump to nvcomp 3.0.6. (#542)

Move to nvcomp 3.0.6. Needed for a hotfix for rapidsai/cudf#15096.

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

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

Author: bdice

rapids-cmake/cpm/versions.json

@@ -84,7 +84,7 @@
       "git_tag" : "978d81a0cba97e3f30508e3c0e3cd65ce94fb699"
     },
     "nvcomp" : {
-      "version" : "3.0.5",
+      "version" : "3.0.6",
       "git_url" : "https://github.com/NVIDIA/nvcomp.git",
       "git_tag" : "v2.2.0",
       "proprietary_binary" : {