Make location a required property

Author: HenrikHL

cs/v1/CS_v1.0.3.yaml

@@ -1703,6 +1703,8 @@ components:
           format: date-time
           example: '2025-01-14T09:21:00+01:00'
           description: The local date and time, when the departure will take place.
+      required:
+        - location
 
     Leg:
       title: Leg