Fix the build

Author: james-cockayne

OmopTransformer/COSD/Staging/CosdStaging.cs

@@ -1,5 +1,4 @@
-using Microsoft.Data.SqlClient;
-using System.IO.Compression;
+using System.IO.Compression;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 

OmopTransformer/Icdo3Resolver.cs

@@ -1,6 +1,4 @@
-using Microsoft.Data.SqlClient;
-using Dapper;
-using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 
 namespace OmopTransformer;