django.core.cache.backends.memcached.MemcachedCache backend is removed

In 4.1 the django.core.cache.backends.memcached.MemcachedCache backend is removed.

https://github.com/django/django/blob/main/docs/releases/4.1.txt#L749

It's been deprecated since 3.2:

https://docs.djangoproject.com/en/4.2/releases/3.2/#features-deprecated-in-3-2

"The django.core.cache.backends.memcached.MemcachedCache backend is deprecated as python-memcached has some problems and seems to be unmaintained. Use django.core.cache.backends.memcached.PyMemcacheCache or django.core.cache.backends.memcached.PyLibMCCache instead."

This results in the following error on Ubuntu Mantic:

InvalidCacheBackendError at /
Could not find backend 'django.core.cache.backends.memcached.MemcachedCache': Module "django.core.cache.backends.memcached" does not define a "MemcachedCache" attribute/class
Request Method: GET
Request URL: http://10.5.3.66/horizon/
Django Version: 4.2.4
Exception Type: InvalidCacheBackendError
Exception Value:
Could not find backend 'django.core.cache.backends.memcached.MemcachedCache': Module "django.core.cache.backends.memcached" does not define a "MemcachedCache" attribute/class
Exception Location: /usr/lib/python3/dist-packages/django/core/cache/__init__.py, line 49, in create_connection
Python Executable: /usr/bin/python3
Python Version: 3.11.6
Python Path:
['/usr/lib/python3/dist-packages',
 '/usr/lib/python311.zip',
 '/usr/lib/python3.11',
 '/usr/lib/python3.11/lib-dynload',
 '/usr/local/lib/python3.11/dist-packages',
 '/usr/lib/python3/dist-packages',
 '/usr/lib/python3/dist-packages/openstack_dashboard']
Server time: Thu, 12 Oct 2023 20:44:30 +0000