Fix:Redis configuration template error in v0.22.1 (#12685)

### What problem does this PR solve?
https://github.com/infiniflow/ragflow/issues/12674

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

docker/service_conf.yaml.template

@@ -51,7 +51,8 @@ redis:
   db: 1
   username: '${REDIS_USERNAME:-}'
   password: '${REDIS_PASSWORD:-infini_rag_flow}'
-  host: '${REDIS_HOST:-redis}:6379'
+  host: '${REDIS_HOST:-redis}'
+  port: '${REDIS_PORT:-6379}'
 user_default_llm:
   default_models:
     embedding_model: