message: Fix Druid granularity timeZone
  timezone -> timeZone
diff: @@ -2202,7 +2202,7 @@ class DruidDatasource(Model, AuditMixinNullable, Queryable, ImportMixin):
  granularity = {'type': 'period'}
  if timezone:
  - granularity['timezone'] = timezone
  + granularity['timeZone'] = timezone
  if origin:
  dttm = utils.parse_human_datetime(origin)
  