Bump celery from 4.4.7 to 5.2.2

Bumps [celery](https://github.com/celery/celery) from 4.4.7 to 5.2.2.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/master/Changelog.rst)
- [Commits](celery/celery@v4.4.7...v5.2.2)

---
updated-dependencies:
- dependency-name: celery
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -2,7 +2,7 @@ requests
 django>=3.1
 django-cors-headers>=3.7
 python-Levenshtein-wheels
-celery==4.4.7
+celery==5.2.2
 django-celery-results
 django-markdownify >= 0.9.2
 attrs >= 20.3.0