Update dotnet version

Author: rezigned

.github/workflows/dotnetcore.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.101
+        dotnet-version: 3.1.200
     - name: Install dependencies
       run: dotnet restore
     - name: Build