Update dotnetcore.yml

Author: myloveCc

.github/workflows/dotnetcore.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Setup .NET Core SDK
       uses: actions/setup-dotnet@v2.1.0
       with:
-        dotnet-version: 6.0
+        dotnet-version: 6.0.*
     - name: Install dependencies
       run: dotnet restore
     - name: Build