fix on trtCudaVersion (#23616)

### Description
<!-- Describe your changes. -->
TensorRT 10.8 zip file has suffix of cuda-12.8, not 12.6


### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->

tools/ci_build/github/azure-pipelines/templates/jobs/download_win_gpu_library.yml

@@ -44,7 +44,7 @@ steps:
           displayName: Set trtCudaVersion
     - ${{ if and(eq(parameters.CudaVersion, '12.2'), eq(parameters.TrtVersion, '10.8.0.43')) }}:
         - powershell: |
-            Write-Host "##vso[task.setvariable variable=trtCudaVersion;]12.6"
+            Write-Host "##vso[task.setvariable variable=trtCudaVersion;]12.8"
           displayName: Set trtCudaVersion
 
     - script: |

tools/ci_build/github/azure-pipelines/templates/jobs/set-winenv.yml

@@ -29,12 +29,12 @@ steps:
           azcopy.exe cp --recursive "https://lotusscus.blob.core.windows.net/models/cuda_sdk/v${{ parameters.SecondaryCUDAVersion }}" $(Agent.TempDirectory)
         displayName: 'Download Secondary CUDA SDK v${{ parameters.SecondaryCUDAVersion }}'
   - ${{ if eq(parameters.DownloadTRT, 'true') }}:
+      - powershell: |
+          azcopy.exe cp --recursive "https://lotusscus.blob.core.windows.net/models/local/${{ parameters.win_trt_folder_cuda12 }}" $(Agent.TempDirectory)
+        displayName: 'Download ${{ parameters.win_trt_folder_cuda12 }}'
       - powershell: |
           azcopy.exe cp --recursive "https://lotusscus.blob.core.windows.net/models/local/${{ parameters.win_trt_folder_cuda11 }}" $(Agent.TempDirectory)
         displayName: 'Download ${{ parameters.win_trt_folder_cuda11 }}'
-      - powershell: |
-          azcopy.exe cp --recursive "https://lotusscus.blob.core.windows.net/models/local/${{ parameters.win_trt_folder_cuda12 }}" $(Agent.TempDirectory)
-        displayName: 'Download ${{ variables.win_trt_folder_cuda12 }}'
 
   - task: BatchScript@1
     displayName: 'setup env'