Removed cache from summit list endpoint

removed cache feature from list of
available summits.

Change-Id: I01e737d61ee5b2b9424de9f80a1c346a2586f14e

app/Repositories/Summit/Doctrine/DoctrineSummitRepository.php

@@ -55,8 +55,6 @@ final class DoctrineSummitRepository extends SilverStripeDoctrineRepository impl
             ->where('s.available_on_api = 1')
             ->orderBy('s.begin_date', 'ASC')
             ->getQuery()
-            ->setCacheable(true)
-            ->setCacheRegion("summit_region")
             ->getResult();
     }
 }