fix ambiguous name

Author: twsouthwick

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParserStateObjectNative.cs

@@ -13,7 +13,6 @@
 using Interop.Windows.Sni;
 using Microsoft.Data.Common;
 using Microsoft.Data.ProviderBase;
-using Microsoft.Data.SqlClient.ManagedSni;
 
 namespace Microsoft.Data.SqlClient
 {
@@ -156,7 +155,7 @@ internal override void CreatePhysicalSNIHandle(
             string serverName,
             TimeoutTimer timeout,
             out byte[] instanceName,
-            out ResolvedServerSpn resolvedSpn,
+            out Microsoft.Data.SqlClient.ManagedSni.ResolvedServerSpn resolvedSpn,
             bool flushCache,
             bool async,
             bool fParallel,