Bump celery from 4.4.7 to 5.2.7

Bumps [celery](https://github.com/celery/celery) from 4.4.7 to 5.2.7.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/master/Changelog.rst)
- [Commits](https://github.com/celery/celery/compare/v4.4.7...v5.2.7)

---
updated-dependencies:
- dependency-name: celery
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

setup.py

@@ -43,7 +43,7 @@ setup(
         'Flask-Caching==1.10.1',
         'Flask-Profiler==1.8.1',
         'geopy==2.2.0',
-        'celery==4.4.7',
+        'celery==5.2.7',
         'Flask-Redis==0.4.0',
         'redis==3.5.3',
         'aerofiles==1.0.0',