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Upgrade Celery and friends to latest versions
We are receiving "Acquire on closed pool" error randomly after running instances for more than ~1 day and calling `self.app.control.cancel_consumer` from our task that kills VM instances. This seems to be a known problem in 3.x Celery verions but some users reported that it's still present in <4.4. - celery/celery#4410 (comment) - https://stackoverflow.com/questions/36789805/celery-kombu-fails-after-self-connections-acquire - celery/celery#1839 Celery released 5.x on September, so I'm upgrading to it directly as a test. If everything keep working together, we can leave it. Otherwise, we can go back to latest 4.4.x series: 4.4.7.
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