Bump celery from 5.1.2 to 5.2.2

Bumps [celery](https://github.com/celery/celery) from 5.1.2 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@v5.1.2...v5.2.2)

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

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

Author: dependabot[bot]

requirements.txt

@@ -5,7 +5,7 @@ billiard==3.6.4.0
 kombu==5.1.0
 boto3==1.16.7
 botocore==1.19.7
-celery==5.1.2
+celery==5.2.2
 cffi==1.14.4
 couchbase==3.0.8
 coverage==4.4.1