Bump redis from 3.5.3 to 4.5.1

Bumps [redis](https://github.com/redis/redis-py) from 3.5.3 to 4.5.1.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](https://github.com/redis/redis-py/compare/3.5.3...v4.5.1)

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

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

setup.py

@@ -45,7 +45,7 @@ setup(
         'geopy==2.2.0',
         'celery==4.4.7',
         'Flask-Redis==0.4.0',
-        'redis==3.5.3',
+        'redis==4.5.1',
         'aerofiles==1.0.0',
         'geoalchemy2==0.9.4',
         'shapely==1.7.1',