Update dependency celery to v4.4.6

[renovate]

This PR contains the following updates:

Package	Update	Change
celery (source)	patch	==4.4.5 -> ==4.4.6

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Release Notes

celery/celery

v4.4.6

Compare Source

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:release-date: 2020-06-24 2.40 P.M UTC+6:00
:release-by: Asif Saif Uddin

• Remove autoscale force_scale methods (#​6085).
• Fix autoscale test
• Pass ping destination to request
• chord: merge init options with run options
• Put back KeyValueStoreBackend.set method without state
• Added --range-prefix option to celery multi (#​6180)
• Added as_list function to AsyncResult class (#​6179)
• Fix CassandraBackend error in threads or gevent pool (#​6147)
• Kombu 4.6.11

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