Increase max size of allowed 'seq' value in schedule

schemas/data-ingress/darwin-data/darwin-schedule.json

@@ -143,7 +143,7 @@
                                     "description": "The sequence in the service at which this location occours",
                                     "type": "integer",
                                     "minimum": 1,
-                                    "maximum": 32767
+                                    "maximum": 2147483647
                                 },
                                 "pta": {
                                     "description": "Public timetable arrival",