Update to nvcomp 2.6 (#341)

Update rapids-cmake to use the nvcomp 2.6

Authors:
  - Robert Maynard (https://github.com/robertmaynard)

Approvers: None

URL: #341

rapids-cmake/cpm/versions.json

@@ -18,12 +18,12 @@
       "git_tag" : "12d13bdc5e74801645eba3e46a64081b9b020dca"
     },
     "nvcomp" : {
-      "version" : "2.5.0",
+      "version" : "2.6.0",
       "git_url" : "https://github.com/NVIDIA/nvcomp.git",
       "git_tag" : "v2.2.0",
       "proprietary_binary" : {
-        "x86_64-linux" :  "https://developer.download.nvidia.com/compute/nvcomp/2.5/local_installers/nvcomp_${version}_x86_64_11.x.tgz",
-        "aarch64-linux" : "https://developer.download.nvidia.com/compute/nvcomp/2.5/local_installers/nvcomp_${version}_SBSA_11.x.tgz"
+        "x86_64-linux" :  "https://developer.download.nvidia.com/compute/nvcomp/${version}/local_installers/nvcomp_${version}_x86_64_11.x.tgz",
+        "aarch64-linux" : "https://developer.download.nvidia.com/compute/nvcomp/${version}/local_installers/nvcomp_${version}_SBSA_11.x.tgz"
       }
     },
     "rmm" : {