Fix CSP for new event wizard (allow loading external style/script files for datepicker)

AKModel/urls.py

+from csp.decorators import csp_update
 from django.apps import apps
 from django.urls import include, path
 from rest_framework.routers import DefaultRouter
@@ -51,7 +52,7 @@ def get_admin_urls_event_wizard(admin_site):
     return [
         path('add/wizard/start/', admin_site.admin_view(NewEventWizardStartView.as_view()),
              name="new_event_wizard_start"),
-        path('add/wizard/settings/', admin_site.admin_view(NewEventWizardSettingsView.as_view()),
+        path('add/wizard/settings/', csp_update(FONT_SRC=["maxcdn.bootstrapcdn.com"], SCRIPT_SRC=["cdnjs.cloudflare.com"], STYLE_SRC=["cdnjs.cloudflare.com"])(admin_site.admin_view(NewEventWizardSettingsView.as_view())),
              name="new_event_wizard_settings"),
         path('add/wizard/created/<slug:event_slug>/', admin_site.admin_view(NewEventWizardPrepareImportView.as_view()),
              name="new_event_wizard_prepare_import"),