- Update to 5.02:
  * Fix _autodiscover_tasks_from_fixups (#6424).
  * Flush worker prints, notably the banner (#6432).
  * Breaking Change: Remove ha_policy from queue definition. (#6440)
  * This argument has no effect since RabbitMQ 3.0. Therefore, We feel
    comfortable dropping it in a patch release.
  * Python 3.9 support (#6418).
  * Regression: When using the prefork pool, pick the fair scheduling strategy
    by default (#6447).
  * Preserve callbacks when replacing a task with a chain (#6189).
  * Fix max_retries override on self.retry() (#6436).
  * Raise proper error when replacing with an empty chain (#6452)
  * Specify UTF-8 as the encoding for log files (#6357).
  * Custom headers now propagate when using the protocol 1 hybrid messages
    (#6374).
  * Retry creating the database schema for the database results backend in case of a race condition (#6298).
  * When using the Redis results backend, awaiting for a chord no longer hangs
    when setting :setting:`result_expires` to 0 (#6373).
  * When a user tries to specify the app as an option for the subcommand, a
    custom error message is displayed (#6363).
  * Fix the --without-gossip, --without-mingle, and --without-heartbeat options
    which now work as expected. (#6365)
  * Provide a clearer error message when the application cannot be loaded.
  * Avoid printing deprecation warnings for settings when they are loaded from
    Django settings (#6385).
  * Allow lowercase log levels for the --loglevel option (#6388).
  * Detaching now works as expected (#6401).
  * Restore broadcasting messages from celery control (#6400).
  * Pass back real result for single task chains (#6411).
  * Ensure group tasks a deeply serialized (#6342).
  * Fix chord element counting (#6354).
  * Restore the celery shell command (#6421).
  * Breaking Change Remove AMQP result backend (#6360).
  * Warn when deprecated settings are used (#6353).
  * Expose retry_policy for Redis result backend (#6330).
  * Prepare Celery to support the yet to be released Python 3.9 (#6328).
  * More cleanups of leftover Python 2 support (#6338).
  * Bump minimum required eventlet version to 0.26.1.
  * Update Couchbase Result backend to use SDK V3.
  * Restore monkeypatching when gevent or eventlet are used.
  * Allow to opt out of ordered group results when using the Redis result
    backend (#6290).
  * Breaking Change Remove the deprecated celery.utils.encoding module.
  * Breaking Change Drop support for the Riak result backend (#5686).
  * Breaking Change pytest plugin is no longer enabled by default (#6288).
    Install pytest-celery to enable it.
  * Breaking Change Brand new CLI based on Click (#5718).
  * Bump Kombu version to 5.0 (#5686).
  * Removed most of the compatibility code that supports Python 2 (#5686).
  * Modernized code to work on Python 3.6 and above (#5686). 
- Update BuildRequires/Requires.
- Add patch move-pytest-configuration-to-conftest.patch to fix testsuite.

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