[Django] #33889: Error in admin.site.register on pypy3.8 Django 4.1 and main

[Django]

#33889: Error in admin.site.register on pypy3.8 Django 4.1 and main
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Reporter: Hasan Ramezani | Owner: nobody
Type: Bug | Status: new
Component: contrib.admin | Version: dev
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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I tried to [https://github.com/jazzband/django-axes/pull/910 include
Django 4.1 in django-axes]. then I noticed the CI fails on
[https://github.com/jazzband/django-
axes/runs/7653550763?check_suite_focus=true Django 4.1] and
[https://github.com/jazzband/django-
axes/runs/7653551446?check_suite_focus=true Django main] with the
following error:

{{{
File "/home/runner/work/django-axes/django-
axes/.tox/pypy38-djmain/lib/pypy3.8/site-
packages/django/contrib/auth/admin.py", line 29, in <module>
class GroupAdmin(admin.ModelAdmin):
File "/home/runner/work/django-axes/django-
axes/.tox/pypy38-djmain/lib/pypy3.8/site-
packages/django/contrib/admin/decorators.py", line 102, in
_model_admin_wrapper
raise ValueError("site must subclass AdminSite")
ValueError: site must subclass AdminSite
}}}

It seems the error comes from
[https://github.com/django/django/blob/0dd29209091280ccf34e07c9468746c396b7778e/django/contrib/admin/decorators.py#L101
register decorator]

I've checked it and found this introduced after
https://github.com/django/django/commit/97d7990abde3fe4b525ae83958fd0b52d6a1d13f

It seems the `if not isinstance(admin_site, AdminSite):` returns `False`
after this change.

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Ticket URL: <https://code.djangoproject.com/ticket/33889>
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