Update pack.yml

Author: hazzik

.github/workflows/pack.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
 
     - name: Pack
       run: dotnet pack -c Release -o out -p:ContinuousIntegrationBuild=true