Fixup setting up the driver, to be squashed.

Author: fredericDelaporte

src/NHibernate.Test/TestCase.cs

@@ -295,7 +295,7 @@ protected virtual DebugSessionFactory BuildSessionFactory()
 			var factory = new DebugSessionFactory(cfg.BuildSessionFactory());
 			// Avoid ORA-12704 in tests, due to NHibernate defaulting String to NVarchar2 when creating tables while
 			// ODP.Net defaults it to Varchar2 (which does support Unicode too, depending on server) for parameters.
-			if (factory.ConnectionProvider?.Driver is OracleManagedDataClientDriver oracleManagedDriver)
+			if (((ISessionFactoryImplementor)factory).ConnectionProvider.Driver is OracleManagedDataClientDriver oracleManagedDriver)
 				oracleManagedDriver.UseNVarchar2ForStringParameter = true;
 			return factory;
 		}