Update dependency django-celery-results to v2

This MR contains the following updates:

Package	Type	Update	Change
django-celery-results	dependencies	major	^1.1.2 -> ^2.0.0

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Release Notes

celery/django-celery-results

v2.0.0

Compare Source

===== :release-date: :release-by:

• Add Spanish translations (#​134)
• Add support for Django 3.0 and 3.1 (#​145, #​163)
• Add support for Celery 5 (#​163)
• Drop support for Django < 2.2 (#​147, #​152)
• Drop support for Python < 3.6 (#​146, #​147, #​152)
• Add Chord syncronisation from the database (#​144)
• Encode task_args and task_kwargs of TaskResult using json.dumps instead of using str (#​78)

.. _version-1.1.2:

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