ycb_django_pr12308

what a new run launched now would send

JSONField are not properly displayed in admin when they are readonly.
Description
	
JSONField values are displayed as dict when readonly in the admin.
For example, {"foo": "bar"} would be displayed as {'foo': 'bar'}, which is not valid JSON.
I believe the fix would be to add a special case in django.contrib.admin.utils.display_for_field to call the prepare_value of the JSONField (not calling json.dumps directly to take care of the InvalidJSONInput case).

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