Django updates

#37040: pylibmc and pymemcache suggested for Memcached cempletely outdated --------------------------

#37039: Outdated QuerySet.iterator() documentation -------------------------------------+------------

#29790: Migration that switches a model to a UUID primary key fails with "duplicate column name:

#37038: {% extends %}/{% block %} doesn't work as expected with {% partialdef %}/{% partial %} --

#35514: Dictionary based EMAIL_PROVIDERS settings -----------------------------+---------------------

#36938: Unioning an ordered queryset fails on Oracle unless a limit is taken ------------------------

#36794: Cache python dependencies on GitHub Actions -------------------------------------+-----------

#36872: Django's template engine cannot handle asynchronous methods -----------------------------

#36955: Add strict template variable support with global and per-variable configuration -------------

#36982: Docs for `ModelAdmin.list_filter` don't mention bare `ListFilter` subclasses as a valid

#37032: Clarify that django.template.context_processors.csrf is enabled by default in ref docs ------

#36602: Enhance showmigrations command with structured data collection and display separation -------

#36990: Referrer header required for django.contrib.gis.forms.widgets.OSMWidget ---------------------

#37036: TypeError when using defer() on a related manager inheriting FETCH_PEERS mode ---------------

#37037: decorator_from_middleware() docs contain stale reference to Django 1.9 ----------------------

#36901: Centralize mitigations against timing attacks targeting user enumeration --------------------

#37013: Omitting tzinfo argument to Trunc & Extract with USE_TZ = True and TIME_ZONE != UTC

#37034: Improve writing migrations how-to add through field on a ManyToManyField --------------------

#37035: Django stops serving requests after killing a task that took too long to shut down ----------

#37025: RemoteUserMiddleware.header does not correspond to request.META in the async path -----------

#36389: GenericRelation uses read connection for writes -------------------------------------+-------

#35870: Allow customization of the blank option in select dropdowns ---------------------------------

#13559: Need a contextprocessor for current site -------------------------------------+--------------

#35813: Makemigrations not properly tracking changes to unmanaged models ----------------------------

#25243: inspectdb crashes if SQLite foreign key references sqlite_master ----------------------------

#22226: Reversing admin URLs requires undocumented filter admin_urlquote. ---------------------------

#24434: Django Custom Field inherits ForeignKey deconstruct() fails ---------------------------------

#37027: refresh_from_db() with from_queryset + prefetch does not persist result in instance ---------

#36983: Improve free-threading performance -------------------------------------+--------------------

#37031: Improve writing migrations guide to adding unique fields on existing table ------------------