Fix RSPec Projects API test
In particular resynced the response for creation if personal limit reached (notably if user is external) to the expected 403.
This instance will be updated to Heptapod 18.6.0rc1 on 2025-12-08 between 11:00 and 12:00 UTC+1 (Europe/Paris)
In particular resynced the response for creation if personal limit reached (notably if user is external) to the expected 403.