chore: add gevent as bundle dependency

[Ian2012]

Description

Adds gevent as a bundle dependency to optimize celery for I/O bound tasks when running multiple queues.

By itself this change will not affect Celery, to work you need to change the pool option from process to gevent and increase the concurrency parameter. This parameter is currently not set by tutor and shouldn't reflect any change on their installations unless it's specifically changed.

For more information on the Celery's pool option: https://celery.school/celery-worker-pools

The technical details can be found here: overhangio/tutor#1130

Supporting information

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Deadline

None

Other information

See openedx/openedx-aspects#116 (comment) for more information

[openedx-webhooks]

Thanks for the pull request, @Ian2012!

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