Update turdis.yml

Author: ToasterBiome

.github/workflows/turdis.yml

@@ -66,6 +66,10 @@ jobs:
       cancel-in-progress: true
     steps:
       - uses: actions/checkout@v4
+      - name: Setup .NET SDK
+      - uses: actions/[email protected]
+        with:
+          dotnet-version: 9.x
       - uses: robinraju/[email protected]
         with:
           repository: "OpenDreamProject/OpenDream"