Bump celery from 4.4.0 to 5.0.0 in /requirements

[dependabot-preview]

Bumps celery from 4.4.0 to 5.0.0.

Release notes

Sourced from celery's releases.

v5.0.0

No release notes provided.

v4.4.7

4.4.7

:release-date: 2020-07-31 11.45 P.M UTC+6:00 :release-by: Asif Saif Uddin

• Add task_received, task_rejected and task_unknown to signals module.
• [ES backend] add 401 as safe for retry.
• treat internal errors as failure.
• Remove redis fanout caveats.
• FIX: -A and --args should behave the same. (#6223)
• Class-based tasks autoretry (#6233)
• Preserve order of group results with Redis result backend (#6218)
• Replace future with celery.five Fixes #6250, and reraise to include
• Fix REMAP_SIGTERM=SIGQUIT not working
• (Fixes#6258) MongoDB: fix for serialization issue (#6259)
• Make use of ordered sets in Redis opt-in
• Test, CI, Docker, style and minor doc impovements.

v4.4.6

No release notes provided.

v4.4.5

https://opencollective.com/celery/updates/celery-4-4-5

v4.4.4

Hotfix release

4.4.3

No release notes provided.

4.4.2

No release notes provided.

4.4.1

Bugfix release with some minor version improvement of kombu and billiard.

Changelog

Sourced from celery's changelog.

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

• 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.

5.0.0rc1

release-date

: 2020-08-24 9.00 P.M UTC+3:00

Commits

• 5e05400 Happify linters.
• a99a903 Bump version: 5.0.0rc3 → 5.0.0
• 661f6b1 Complete release notes.
• 67052f3 pyupgrade.
• 1c6be61 Mention ordered group results are now the default.
• c0b158d Fix phrasing.
• be8547e Mention retry policy for the redis result backend.
• 518bf9f Mention the new pytest-celery plugin.
• 1b01683 PyPy 3.7 is currently in alpha.
• d1b5965 isort.
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #69.