Django updates

#37050: Improve simple_tag / simple_block_tag error message when as is used without a variable name -

#36919: Allow `TaskResult` (and `Task`) to be pickled -------------------------------------+---------

#30159: Remove obsolete use of OrderedDict with Python 3.6+ -------------------------------------+---

#37048: Backwards incompatible change to InclusionAdminNode ---------------------------------+-------

#37046: PR Quality check may need to account for ready for check-in ---------------------------------

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

#37049: Changing a m2m through= from one custom model to another is no-op'd instead of raising an

#20151: get_deleted_objects does not check permissions on proxy model objects without ModelAdmin ----

#36912: Q.create() doesn't validate connectors as Q.__init__() does -----------------------------

#37045: Deprecate and rename django.db.transaction.savepoint -------------------------------------+--

#35007: Add a formatter for CSS and JS -------------------------------------+------------------------

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

#31398: multiple_database.tests.AuthTestCase doesn't flush the default database if transactions

#36728: Validate template tag context argument at definition time, rather than compile time ---------

#37047: Crash in Query.orderby_issubset_groupby for descending and random order_by strings ----------

#26434: Inconsistent results of QuerySet.count() when ordering is not a subset of explicit grouping.

#32565: Extract URL resolver view strings mapping to admindocs --------------------------------------

#37039: Outdated QuerySet.iterator() documentation -------------------------------------+------------

#37044: Mention in FileField-.upload_to-Documentation that file locations on authenticated models are

#36235: RelatedManager.all().get_or_create() does not work -------------------------------------+----

#11383: Admin action 'Delete selected' check only global model delete permission ------------

#36542: AdminSite views (such as login) leak sensitive POST data ------------------------------------

#36933: Yes/no admin icons hard to differentiate with dichromatic viewing deficiency ----------------

#37043: Display a map for readonly GeometryField ------------------------------------------+---------

#37028: Cross-database support for `BitAnd()`, `BitOr()`, and `BitXor()` aggregates -----------------

#34035: ImageField doesn't consider EXIF rotation when storing width and height -----------------

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

#37041: get_image_dimensions() ignores exif rotation -------------------------------------+----------

#37041: get_image_dimensions ignores exif roration -------------------------------------+------------

#37042: alogin() does not invalidate _acached_user, causing stale AnonymousUser after async login ---