Use correct version of .net sdk to allow the build to work

Author: Triogap

.github/workflows/nuget-publish.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: '8.0.x'
+          dotnet-version: '9.0.x'
 
       - name: Restore dependencies
         run: dotnet restore