fix: Update deploy.yml to .net 8.0

Author: BenjaminMichaelis

.github/workflows/deploy.yml

@@ -19,9 +19,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: | 
-            3.1.x
-            6.x
+        dotnet-version: 8.0
     - name: Setup Dependency Caching
       uses: actions/cache@v3
       id: nuget-cache