Fixes #4458: Remove custom admin site to avoid conflict with django-rq 2.3.0

netbox/secrets/admin.py

@@ -1,12 +1,11 @@
 from django.contrib import admin, messages
 from django.shortcuts import redirect, render
 
-from netbox.admin import admin_site
 from .forms import ActivateUserKeyForm
 from .models import UserKey
 
 
-@admin.register(UserKey, site=admin_site)
+@admin.register(UserKey)
 class UserKeyAdmin(admin.ModelAdmin):
     actions = ['activate_selected']
     list_display = ['user', 'is_filled', 'is_active', 'created']