Update `ldap_connect` usage to avoid deprecated syntax

[ssddanbrown]

Usage of ldap_connect with two params is considered deprecated.
Will likely be official deprecated in code from PHP 8.3.

We use this deprecated syntax by default:

BookStack/app/Access/Ldap.php

Line 19 in 295cd01

return ldap_connect($hostName, $port);

Note: I think we do essentially use this in the single-param format in many cases, but we always pass a second param to align usage (Which I believe essentially gets ignored).

Assigning to next feature release but we got a fair amount of time before PHP 8.3 so could be moved if needed.