Support OpenLDAP 2.5+

For context see:

https://bugzilla.redhat.com/show_bug.cgi?id=2150344 https://github.com/EGI-Federation/bdii/pull/42 https://github.com/EGI-Federation/bdii/issues/41

Fixes infosys-ldap om EPEL 9, Fedora 36+ and others with OpenLDAP 2.5+.

added cherrypick:next component:infosys type:bugfix labels

added xarcbot-cherrypick-SUCCESS-to:next label and removed cherrypick:next label

mentioned in merge request !1559 (merged)

merged

mentioned in commit 9af3c83e

changed milestone to %Release ARC 6.18