Try to use roll forward on dotnet script

Author: GlebChili

.github/workflows/ci.yml

@@ -329,11 +329,6 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v2.3.4
 
-      - name: Setup .NET Core SDK (old)
-        uses: actions/setup-dotnet@v1.7.2
-        with:
-          dotnet-version: 5.0.202
-
       - name: Setup .NET Core SDK
         uses: actions/setup-dotnet@v1.8.1