Update dependency Celery to v5

This MR contains the following updates:

Package	Type	Update	Change
Celery	dependencies	major	^4.4.0 -> ^5.0.0

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This MR has been generated by Renovate Bot.

Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this MR as-is.

Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you check the rebase/retry checkbox if found above, or
• you rename this MR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: poetry.lock

Creating virtualenv aleksis-core-VCs0wlCr-py3.8 in /home/ubuntu/.cache/pypoetry/virtualenvs
Updating dependencies
Resolving dependencies...

[SolverProblemError]
Because no versions of django-celery-results match >1.1.2,<1.2.0 || >1.2.0,<1.2.1 || >1.2.1,<2.0.0
 and django-celery-results (1.1.2) depends on celery (>=4.3,<5.0), django-celery-results (>=1.1.2,<1.2.0 || >1.2.0,<1.2.1 || >1.2.1,<2.0.0) requires celery (>=4.3,<5.0).
And because django-celery-results (1.2.0) depends on celery (>=4.4,<5.0)
 and django-celery-results (1.2.1) depends on celery (>=4.4,<5.0), django-celery-results (>=1.1.2,<2.0.0) requires celery (>=4.3,<5.0).
So, because aleksis-core depends on both Celery (^5.0.0) and django-celery-results (^1.1.2), version solving failed.

marked the checklist item If you want to rebase/retry this MR, check this box as completed

marked the checklist item If you want to rebase/retry this MR, check this box as incomplete

added 3 commits

• 31e0aae8...d1ff5fff - 2 commits from branch master
• b4cacc3c - Update dependency Celery to v5

Compare with previous version

marked the checklist item If you want to rebase/retry this MR, check this box as completed

marked the checklist item If you want to rebase/retry this MR, check this box as incomplete

added 43 commits

• b4cacc3c...fb519417 - 42 commits from branch master
• 2a732ad6 - Update dependency Celery to v5

Compare with previous version

added 7 commits

• 2a732ad6...5f3df6e7 - 6 commits from branch master
• bc2f6ffb - Merge branch 'master' into renovate/celery-5.x

Compare with previous version

merged

mentioned in commit e70de380