Upgrade redis and set specific version

Different versions of the redis-py library support different versions of
redis. Use an explicit version in docker-compose.yml and update python
dependency to a version which supports it.

docker-compose.yml

@@ -59,7 +59,7 @@ services:
 
     # Redis (caches)
     redis:
-        image: redis:alpine
+        image: redis:7.4.2
         command: redis-server --port 6379
 
     # Celery broker (queue manager)

requirements.in

@@ -49,7 +49,7 @@ pysolr==3.10.0b1
 python-louvain==0.16  # community detection in clustering
 pytz==2023.3
 PyYAML==6.0.1
-redis==3.2.0
+redis==5.2.1
 scikit-learn==1.4.1.post1  # clustering
 scipy==1.12.0  # clustering
 sentry-sdk[django]~=1.31

requirements.txt

@@ -14,6 +14,8 @@ asgiref==3.7.2
     # via django
 asttokens==2.4.1
     # via stack-data
+async-timeout==5.0.1
+    # via redis
 autopep8==1.5.7
     # via
     #   -r requirements.in
@@ -279,7 +281,7 @@ pyyaml==6.0.1
     # via
     #   -r requirements.in
     #   djangorestframework-yaml
-redis==3.2.0
+redis==5.2.1
     # via
     #   -r requirements.in
     #   django-redis
@@ -302,7 +304,9 @@ scipy==1.12.0
     #   -r requirements.in
     #   scikit-learn
 sentry-sdk[django]==1.39.1
-    # via -r requirements.in
+    # via
+    #   -r requirements.in
+    #   sentry-sdk
 sgmllib3k==1.0.0
     # via feedparser
 six==1.16.0