Description of problem:

The current packaged version of python3-celery in Fedora 30 is not entirely compatible with Python 3.7. In particular, the following commit is necessary to add Python 3.7 compatibility:
https://github.com/celery/celery/commit/1c3a15938d0b9dde674d4666689d6a6c733d64e4

Without it, `AttributeError: module 're' has no attribute '_pattern_type'` is raised whenever the `task_routes` configuration is defined.

This commit is part of the v4.3.0 release.

Version-Release number of selected component (if applicable):

4.2.1-4

How reproducible:

It is easily reproducible.

Steps to Reproduce:
1. Configure the `task_routes` Celery configuration with any value
2. Schedule a task

Actual results:

AttributeError: module 're' has no attribute '_pattern_type'


Expected results:

It shouldn't raise an exception.