chore(deps): update redis docker tag to v8

Author: renovate[bot]

docker/docker-compose.yml

@@ -20,7 +20,7 @@ services:
 
   # Redis (for session storage and Socket.io adapter)
   redis:
-    image: redis:7-alpine
+    image: redis:8-alpine
     container_name: renovate-dashboard-redis
     restart: unless-stopped
     command: redis-server --appendonly yes

helm/renovate-dashboard/values.yaml

@@ -288,7 +288,7 @@ redis:
 
   image:
     repository: redis
-    tag: "7-alpine"
+    tag: "8-alpine"
     pullPolicy: IfNotPresent
 
   # Redis authentication