Remove direct usage of redis in application code (#67)

This appeared to only be required by RedisLock, which was unused. We
are still depending on redis itself as the celery backend.

Author: jgraham

pyproject.toml

@@ -51,7 +51,6 @@ server = [
     "djangorestframework~=3.15.1",
     "google-cloud-bigquery",
     "pyyaml",
-    "redis[hiredis]",
     "whitenoise~=6.6.0",
 ]
 

requirements.txt

@@ -8,8 +8,6 @@ amqp==5.3.1
     # via kombu
 asgiref==3.8.1
     # via django
-async-timeout==5.0.1
-    # via redis
 attrs==24.2.0
     # via
     #   jsonschema
@@ -91,8 +89,6 @@ grpcio-status==1.68.1
     # via google-api-core
 gunicorn==22.0.0
     # via WebCompatManager (pyproject.toml)
-hiredis==3.1.0
-    # via redis
 idna==3.10
     # via requests
 josepy==1.14.0
@@ -142,8 +138,6 @@ python-dateutil==2.9.0.post0
     #   google-cloud-bigquery
 pyyaml==6.0.2
     # via WebCompatManager (pyproject.toml)
-redis==5.2.0
-    # via WebCompatManager (pyproject.toml)
 referencing==0.35.1
     # via
     #   jsonschema