Bump redis from 3.3.10 to 3.3.11

Bumps [redis](https://github.com/andymccurdy/redis-py) from 3.3.10 to 3.3.11.
- [Release notes](https://github.com/andymccurdy/redis-py/releases)
- [Changelog](https://github.com/andymccurdy/redis-py/blob/master/CHANGES)
- [Commits](https://github.com/andymccurdy/redis-py/compare/3.3.10...3.3.11)

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

setup.py

@@ -40,7 +40,7 @@ setup(
         'Flask-Caching==1.7.2',
         'geopy==1.20.0',
         'celery==4.3.0',
-	'redis==3.3.10',
+	'redis==3.3.11',
         'aerofiles==1.0.0',
         'geoalchemy2==0.6.3',
         'shapely==1.6.4.post2',