* url() is deprecated in Django 3.1
* update given feedbacks on url() is deprecated in Django 3.1
* Fix test_urlpatterns.py to continue testing mixed re_path() and path()
* Fix one missed reference
Co-authored-by: sanjusci <sanju.sci9@gmail.com>
Use of PyYAML's yaml.load function without specifying the Loader
parameter has been deprecated, see https://msg.pyyaml.org/load.
Earlier versions of PyYAML already had the alternative safe_load
function, which limits the loader to a subset of YAML constructs, that
is enough for what we need here.
Fixes#6677
