Update nuget-publish.yml

Author: jaccz

.github/workflows/nuget-publish.yml

@@ -39,4 +39,4 @@ jobs:
       run: nuget pack
 
     - name: Publish NuGet package
-      run: dotnet nuget push "Microsoft.Test.Pict.*.nupkg" -k ${{ secrets.GITHUB_TOKEN }} -s https://nuget.pkg.github.com/microsoft/index.json
+      run: dotnet nuget push "Microsoft.Test.Pict.*.nupkg" -k ${{ secrets.GITHUB_TOKEN }} -s https://nuget.pkg.github.com/microsoft/index.json --skip-duplicate