Update publish-nuget.yml to correct feed. (#24299)

### Description
Since we are no longer supporting cuda 11, we want to update the
`publish-nuget.ym`l to the correct feed.



### 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. -->

Author: jchen351

tools/ci_build/github/azure-pipelines/publish-nuget.yml

@@ -21,9 +21,9 @@ parameters:
 variables:
 - name: ArtifactFeed
   ${{ if eq(parameters.isReleaseBuild, false) }}:
-    value: ort-cuda-11-nightly
+    value: ORT-Nightly
   ${{ else }}:
-    value: onnxruntime-cuda-11
+    value: onnxruntime-cuda-12
 extends:
   # The pipeline extends the 1ES PT which will inject different SDL and compliance tasks.
   # For non-production pipelines, use "Unofficial" as defined below.