Upgrade spectacular to the latest version

https://redmine.teklia.com/issues/7391

Closes #1769 (closed), nukes !1471 (closed)

changed milestone to %Arkindex 1.6.1

requested review from @babadie

assigned to @erouchet

changed the description

resolved all threads

Tested on arkindex EE + docker build

I also compared openapi schemas from current prod 1.6.0 against the one produced by this patch on EE (see attached files).

Entity roles endpoint disappear, we see some change related to ponos agents, and the min/max attributes + description already mentionned.

LGTM !

merged