Django 5.1: use mark_safe for PrettyJSONWidget

[b0uh]

After upgrading to Django 5.1 we notice that the PrettyJSONWidget was broken in the admin. It seems to be because the HTML code returned is not marked as safe.

I tested the behavior locally and also run the tests coming along the projects to be sure I was not breaking anything.

Before

After

[b0uh]

If someone else has this issue, the following snippet is a temporary workaround:

from django.utils.safestring import mark_safe
from prettyjson import PrettyJSONWidget

class PrettyJSONWidgetFixed(PrettyJSONWidget):
    def render(self, name, value, attrs=None, **kwargs):
        return mark_safe(super().render(name, value, attrs=None, **kwargs))

[makulatur]

Would be nice to have this merged