UPDATING: Add upgrade instructions for net-mgmt/netbox

Give users some advice about the upgrade to the NetBox 4.3 release
series.

UPDATING

@@ -5,6 +5,16 @@ they are unavoidable.
 You should get into the habit of checking this file for changes each time
 you update your ports collection, before attempting any port upgrades.
 
+20250622:
+  AFFECTS: users of net-mgmt/netbox
+  AUTHOR: kai@FreeBSD.org
+
+  1. Please make sure that the PostgreSQL server for the NetBox instance is
+     running version 14 or higher.  This is because Django 5.2 requires
+     PostgreSQL 14 as a minimum.
+
+  2. Please also check the pkg-message and the changelogs for further info.
+
 20250620:
   AFFECTS: users of x11/swww
   AUTHOR: nivit@FreeBSD.org