Update celery to 4.4.1

[pyup-bot]

This PR updates celery from 4.3.0 to 4.4.1.

Changelog

### 4.4.0 ``` ======= :release-date: 2019-12-16 9.45 A.M UTC+6:00 :release-by: Asif Saif Uddin - This version is officially supported on CPython 2.7, 3.5, 3.6, 3.7 & 3.8 and is also supported on PyPy2 & PyPy3. - Kombu 4.6.7 - Task class definitions can have retry attributes (5869) ``` ### 4.4.0rc5 ``` ======== :release-date: 2019-12-07 21.05 A.M UTC+6:00 :release-by: Asif Saif Uddin - Kombu 4.6.7 - Events bootstep disabled if no events (5807) - SQS - Reject on failure (5843) - Add a concurrency model with ThreadPoolExecutor (5099) - Add auto expiry for DynamoDB backend (5805) - Store extending result in all backends (5661) - Fix a race condition when publishing a very large chord header (5850) - Improve docs and test matrix ``` ### 4.4.0rc4 ``` ======== :release-date: 2019-11-11 00.45 A.M UTC+6:00 :release-by: Asif Saif Uddin - Kombu 4.6.6 - Py-AMQP 2.5.2 - Python 3.8 - Numerious bug fixes - PyPy 7.2 ``` ### 4.4.0rc3 ``` ======== :release-date: 2019-08-14 23.00 P.M UTC+6:00 :release-by: Asif Saif Uddin - Kombu 4.6.4 - Billiard 3.6.1 - Py-AMQP 2.5.1 - Avoid serializing datetime (5606) - Fix: (group() | group()) not equals single group (5574) - Revert "Broker connection uses the heartbeat setting from app config. - Additional file descriptor safety checks. - fixed call for null args (5631) - Added generic path for cache backend. - Fix Nested group(chain(group)) fails (5638) - Use self.run() when overriding __call__ (5652) - Fix termination of asyncloop (5671) - Fix migrate task to work with both v1 and v2 of the message protocol. - Updating task_routes config during runtime now have effect. ``` ### 4.4.0rc2 ``` ======== :release-date: 2019-06-15 4:00 A.M UTC+6:00 :release-by: Asif Saif Uddin - Many bugs and regressions fixed. - Kombu 4.6.3 ``` ### 4.4.0rc1 ``` ======== :release-date: 2019-06-06 1:00 P.M UTC+6:00 :release-by: Asif Saif Uddin - Python 3.4 drop - Kombu 4.6.1 - Replace deprecated PyMongo methods usage (5443) - Pass task request when calling update_state (5474) - Fix bug in remaining time calculation in case of DST time change (5411) - Fix missing task name when requesting extended result (5439) - Fix `collections` import issue on Python 2.7 (5428) - handle `AttributeError` in base backend exception deserializer (5435) - Make `AsynPool`'s `proc_alive_timeout` configurable (5476) - AMQP Support for extended result (5495) - Fix SQL Alchemy results backend to work with extended result (5498) - Fix restoring of exceptions with required param (5500) - Django: Re-raise exception if `ImportError` not caused by missing tasks module (5211) - Django: fixed a regression putting DB connections in invalid state when `CONN_MAX_AGE != 0` (5515) - Fixed `OSError` leading to lost connection to broker (4457) - Fixed an issue with inspect API unable get details of Request - Fix mogodb backend authentication (5527) - Change column type for Extended Task Meta args/kwargs to LargeBinary - Handle http_auth in Elasticsearch backend results (5545) - Fix task serializer being ignored with `task_always_eager=True` (5549) - Fix `task.replace` to work in `.apply() as well as `.apply_async()` (5540) - Fix sending of `worker_process_init` signal for solo worker (5562) - Fix exception message upacking (5565) - Add delay parameter function to beat_schedule (5558) - Multiple documentation updates ```

Links

- PyPI: https://pypi.org/project/celery - Changelog: https://pyup.io/changelogs/celery/ - Homepage: http://celeryproject.org - Docs: https://pythonhosted.org/celery/

[pyup-bot]

Closing this in favor of #612