Use CCCL v2.7.0 final tag. (#743)

CCCL is currently pinned to `v2.7.0-rc2`. Now that a final tag for `v2.7.0` is available, we should use that instead.

See diff: NVIDIA/cccl@v2.7.0-rc2...v2.7.0

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

Approvers:
  - Kyle Edwards (https://github.com/KyleFromNVIDIA)

URL: #743

rapids-cmake/cpm/versions.json

@@ -14,7 +14,7 @@
       "version": "2.7.0",
       "git_shallow": false,
       "git_url": "https://github.com/NVIDIA/cccl.git",
-      "git_tag": "83028fcdcfa8de51ab359e61ce07198a6003a65e"
+      "git_tag": "v${version}"
     },
     "cuco": {
       "version": "0.0.1",

testing/cpm/cpm_cccl-version-2-7.cmake

@@ -1,5 +1,5 @@
 #=============================================================================
-# Copyright (c) 2024, NVIDIA CORPORATION.
+# Copyright (c) 2024-2025, NVIDIA CORPORATION.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -32,7 +32,7 @@ file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/override.json
       "version": "2.7.0",
       "git_shallow": false,
       "git_url": "https://github.com/NVIDIA/cccl.git",
-      "git_tag": "v2.7.0-rc2"
+      "git_tag": "v2.7.0"
     }
   }
 }