install both dotnet 9 and 8

Author: r58Playz

.github/workflows/main.yml

@@ -36,7 +36,9 @@ jobs:
       - name: Setup Dotnet
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: "9.0.203"
+          dotnet-version: |
+            9.0.x
+            8.0.x
 
       - name: Install mono
         run: sudo apt-get install mono-devel