Update Redis and Redis accessories (#6016)

This originally started as a security update for redis-py (see
<https://github.com/redis/redis-py/releases/tag/v4.5.3>,
<https://github.com/redis/redis-py/releases/tag/v4.5.4>). However, I
also had to update other Redis-related components because of
incompatibilities.

* The old version of fakeredis is not compatible with the redis-py 4.x,
so I bumped it too. This also allowed me to remove the six workaround.

* redis-py 4.1.0 and newer don't support Redis < 5, so I bumped Redis
itself in `docker-compose.yml`. Note that the Helm chart is already
using Redis 7.0.x.

Obsoletes #5946.

CHANGELOG.md

@@ -72,7 +72,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - The issue related to webhook events not being sent has been resolved (<https://github.com/opencv/cvat/pull/5916>)
 
 ### Security
-- TDB
+- Updated Redis (in the Compose file) to 7.0.x, and redis-py to 4.5.4
+  (<https://github.com/opencv/cvat/pull/6016>)
 
 ## \[2.4.1] - 2023-04-05
 ### Fixed

cvat/requirements/base.txt

@@ -19,7 +19,7 @@ python-ldap==3.4.3
 pytz==2020.1
 pyunpack==0.2.1
 rcssmin==1.0.6
-redis==3.5.3
+redis==4.5.4
 rjsmin==1.1.0
 requests==2.26.0
 rq==1.5.2

cvat/requirements/testing.txt

 -r development.txt
-fakeredis==1.4.3
-# Fix dependencies for fakeredis 1.1.0
-# Pip will not reinstall six package if it is installed already
-six==1.15.0
-coveralls
\ No newline at end of file
+coveralls
+fakeredis==2.10.3

docker-compose.yml

@@ -18,7 +18,7 @@ services:
 
   cvat_redis:
     container_name: cvat_redis
-    image: redis:4.0-alpine
+    image: redis:7.0-alpine
     restart: always
     networks:
       - cvat