Remove unused usings.

Signed-off-by: Bradley Grainger <[email protected]>

Author: bgrainger

src/MySqlConnector/MySqlCommand.cs

@@ -1,8 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
-using System.Runtime.InteropServices;
 using Microsoft.Extensions.Logging;
 using MySqlConnector.Core;
-using MySqlConnector.Protocol;
 using MySqlConnector.Protocol.Serialization;
 using MySqlConnector.Utilities;