Bump celery from 4.4.7 to 5.0.2 in /requirements

[dependabot]

Bumps celery from 4.4.7 to 5.0.2.

Changelog

Sourced from celery's changelog.

5.0.2

:release-date: 2020-11-02 8.00 P.M UTC+2:00 :release-by: Omer Katz

• 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)

.. _version-5.0.1:

5.0.1

:release-date: 2020-10-18 1.00 P.M UTC+3:00 :release-by: Omer Katz

• 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).

.. _version-5.0.0:

5.0.0

... (truncated)

Commits

• f50cf7d Bump version: 5.0.1 → 5.0.2
• 8bed67c Update changelog.
• 6cf4f40 Raise proper error when replacing with an empty chain. (#6452)
• 8fee0bf Happify linter.
• 0833a27 Fix max_retries override on self.retry (#6436)
• f1145a2 Fix minor documentation omission (#6453)
• 56fc486 Preserve callbacks when replacing a task with a chain (#6189)
• 0db172e fix: Ensure default fairness maps to SCHED_FAIR (#6447)
• 70dc29e move to travis-ci.com
• 7c3da03 docs: fix celery beat settings
• Additional commits viewable in compare view

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[dependabot]

Superseded by #72.