Bump celery from 4.4.7 to 5.0.3 in /requirements

[dependabot[bot]]

Bumps celery from 4.4.7 to 5.0.3.

Changelog

Sourced from celery's changelog.

5.0.3

:release-date: 2020-12-03 6.30 P.M UTC+2:00 :release-by: Omer Katz

• Make --workdir eager for early handling (#6457).
• When using the MongoDB backend, don't cleanup if result_expires is 0 or None (#6462).
• Fix passing queues into purge command (#6469).
• Restore app.start() and app.worker_main() (#6481).
• Detaching no longer creates an extra log file (#6426).
• Result backend instances are now thread local to ensure thread safety (#6416).
• Don't upgrade click to 8.x since click-repl doesn't support it yet.
• Restore preload options (#6516).

.. _version-5.0.2:

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

... (truncated)

Commits

• a4d942b Bump version: 5.0.2 → 5.0.3
• 39db90c Changelog for 5.0.3.
• 4fad907 Reintroduce support for custom preload options (#6516)
• 0fa4db8 Revert "redis: Support Sentinel with SSL" (#6518)
• 18a0963 redis: Support Sentinel with SSL
• 1c076a6 update step to install homebrew
• 3a81c26 Update documentation on changes to custom CLI options in 5.0.
• 208e90e Don't upgrade click to 8.x since click-repl doesn't support it yet.
• ee13eae Update testing.rst (#6507)
• 443ef65 Fix inconsistency in documentation for link_error (#6505)
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #100.