Update dotnet.yml

Author: BifrostTitan

.github/workflows/dotnet.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 6.0.x
+          dotnet-version: 8.0.x
       - name: Check out Code
         uses: actions/checkout@v2
         with: