Pin NVBench to a known working SHA1 (#112)

NVBench has rolled out a new CMake build-system. Currently RAPIDS projects are seeing issues integrating it into other projects. So we are going to pin the NVBench SHA1 while upstream fixes issues.

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

Approvers: None

URL: #112

rapids-cmake/cpm/versions.json

@@ -9,7 +9,7 @@
     "nvbench" : {
       "version" : "0.0",
       "git_url" : "https://github.com/NVIDIA/nvbench.git",
-      "git_tag" : "main"
+      "git_tag" : "ed27365a418d608f6ff2268ad93da5177caa647b"
     },
     "rmm" : {
       "version" : "${rapids-cmake-version}",