Upgrade to celery 5.1.2, flower 1.0.0

[aaron-lane]

This pull request upgrades the application to use celery 5.1.2 and flower 1.0.0, the latest patches of the first releases that support Python 3.9.

I referenced the following articles to make these changes:

• https://docs.celeryq.dev/en/v5.1.2/whatsnew-5.1.html
• https://docs.celeryq.dev/en/v5.1.2/django/first-steps-with-django.html
• https://docs.celeryq.dev/en/v5.1.2/userguide/application.html

[aaron-lane]

Closing in favour of reBOOT-Canada#1, since we should be focused on the fork.

[FLRota]

Not sure if that's a good thing but thanks for working on this! Get Outlook for Android<https://aka.ms/AAb9ysg>

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