Update push-nuget.yml

Author: JunaMeinhold

.github/workflows/push-nuget.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: '8.0.x'  # Change this to your required .NET version
+          dotnet-version: '9.0.x'  # Change this to your required .NET version
 
       - name: Restore dependencies
         run: |