Update dotnetcore.yml

Author: stanac

.github/workflows/dotnetcore.yml

@@ -17,9 +17,8 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          6.0.x
-          7.0.x
           8.0.x
+          9.0.x
     - name: Install dependencies
       run: dotnet restore
     - name: Build