TT#68300 Use parent instead of base

The former is more lightweight and the current recommended pragma.

Change-Id: I19bb73df214f82f65620fb38f1efa9820c1a9e4a

lib/NGCP/API/Client.pm

@@ -163,7 +163,8 @@ sub set_verbose {
 package NGCP::API::Client::Result;
 use warnings;
 use strict;
-use base qw(HTTP::Response);
+use parent qw(HTTP::Response);
+
 use JSON qw(from_json);
 
 sub new {