fixtures: update third org circulation policy

In order to allow renewal on the same day of a checkout during a RERO
ILS workshop, the renewal duration is two days longer than the checkout
duration.

Co-Authored-by: Igor Milhit <igor.milhit@rero.ch>

data/circulation_policies.json

@@ -384,7 +384,7 @@
       "$ref": "https://ils.rero.ch/api/organisations/3"
     },
     "allow_checkout": true,
-    "checkout_duration": 30,
+    "checkout_duration": 28,
     "allow_requests": true,
     "number_of_days_before_due_date": 5,
     "number_of_days_after_due_date": 5,