Bump celery from 4.4.7 to 5.0.1 in /requirements

[dependabot]

Bumps celery from 4.4.7 to 5.0.1.

Changelog

Sourced from celery's changelog.

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

:release-date: 2020-09-24 6.00 P.M UTC+3:00 :release-by: Omer Katz

• 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).

5.0.0rc3

:release-date: 2020-09-07 4.00 P.M UTC+3:00 :release-by: Omer Katz

• More cleanups of leftover Python 2 support (#6338).

5.0.0rc2

:release-date: 2020-09-01 6.30 P.M UTC+3:00 :release-by: Omer Katz

... (truncated)

Commits

• b50b178 Bump version: 5.0.0 → 5.0.1
• 387518c Update changelog.
• e966cf1 predefined_queues_urls -> predefined_queues
• 9b78de8 Fix celery shell command
• 6957f96 fix: Ensure group tasks are deeply deserialised
• 56acb7b test: Add more tests for from_dict() variants
• 89d50f5 test: Use all() for subtask checks in canvas tests
• b57ac62 test: Improve chord body group index freezing test
• d1305f3 Copy annotations when creating tasks
• 05da357 Mention removed deprecated modules in the release notes.
• Additional commits viewable in compare view

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[dependabot]

Superseded by #66.