build(deps): bump redis from 7-alpine to 8-alpine

Bumps redis from 7-alpine to 8-alpine.

---
updated-dependencies:
- dependency-name: redis
  dependency-version: 8-alpine
  dependency-type: direct:production
...

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

docker-compose.postgres.yml

@@ -31,7 +31,7 @@ services:
 
   redis:
     container_name: yamtrack-redis
-    image: redis:7-alpine
+    image: redis:8-alpine
     restart: unless-stopped
     volumes:
       - redis_data:/data

docker-compose.yml

@@ -16,7 +16,7 @@ services:
 
   redis:
     container_name: yamtrack-redis
-    image: redis:7-alpine
+    image: redis:8-alpine
     restart: unless-stopped
     volumes:
       - redis_data:/data