Update dotnet-core.yml

dotnet sdk 7 for now

Author: smoothdeveloper

.github/workflows/dotnet-core.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 8.0.100
+        dotnet-version: 7.0.400
 
     - name: Install SQL Server
       # reference @ https://github.com/Particular/install-sql-server-action