[pull] main from django:main - #552
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…ecation. django.utils.deprecation imported django.middleware.MiddlewareMixin at module level, solely to serve its deprecated __getattr__ import path. That gave the module a hard dependency on asgiref (via django.middleware) merely to be imported, which breaks in contexts where Django's own runtime dependencies aren't installed yet, such as a PEP 517 build backend resolving django.__version__ before installing install_requires.
From Django 2028, feature releases are calendar versioned as YYYY[.N], where N is the patch number, as per DEP 20. A version is now read as the numbers of the printed version followed by the status and its iteration, so calendar versions have four components, (year, patch, status, iteration), while the earlier scheme keeps its five. django.VERSION is now a VersionTuple, providing `.feature`, `.patch`, `.status`, and `.iteration` attributes which give the same answers under both schemes. Indexing it from its third component on, reading it in a way which depends on its length, and comparing it against three or more components are deprecated, as each breaks or silently changes meaning when the tuple loses a component. Thanks Carlton Gibson for reviews.
Thanks Jake Howard for the reivew.
…ue and no tzinfo. In Django 2029, the current timezone will be stored in the migration.
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