HHH-18314 don't use streams for LOB binding on Db2

Since:

- we can use the JDBC LOB APIs, and
- setNCharacterStream() is not implemented by the driver

Signed-off-by: Gavin King <gavin@hibernate.org>

hibernate-core/src/main/java/org/hibernate/dialect/DB2Dialect.java

@@ -960,6 +960,11 @@ public class DB2Dialect extends Dialect {
 		return false;
 	}
 
+	@Override
+	public boolean useInputStreamToInsertBlob() {
+		return false;
+	}
+
 	@Override
 	public boolean doesReadCommittedCauseWritersToBlockReaders() {
 		return true;