refa(tests): enable async true in oban cron test

Author: solnic

test/sentry/integrations/oban/cron_test.exs

@@ -1,10 +1,10 @@
 defmodule Sentry.Integrations.Oban.CronTest do
-  alias Sentry.Integrations.CheckInIDMappings
-  use Sentry.Case, async: false
+  use Sentry.Case, async: true
 
   import Sentry.Test.Assertions
   import Sentry.TestHelpers
 
+  alias Sentry.Integrations.CheckInIDMappings
   alias Sentry.Test, as: SentryTest
 
   setup context do