fix(DHCPServer): use new pfsense dhcp server apply method

2.8.0+ introduced a new method to apply dhcp server changes. This commit updates the codebase to use that method instead of the old services_dhcpd_configure() method.

Author: jaredhendrickson13

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Dispatchers/DHCPServerApplyDispatcher.inc

@@ -13,7 +13,7 @@ class DHCPServerApplyDispatcher extends Dispatcher {
      * Reloads the DHCP server and associated services.
      */
     protected function _process(mixed ...$arguments): void {
-        services_dhcpd_configure();
+        dhcp_apply_changes();
         clear_subsystem_dirty('dhcpd');
     }
 }