Update .env ,Defaults to the v0.19.1-slim edition (#8412)

### What problem does this PR solve?

Update .env ,Defaults to the v0.19.1-slim edition

### Type of change

- [x] Other (please describe): Update .env ,Defaults to the
v0.19.1-slim edition

docker/.env

@@ -91,13 +91,13 @@ REDIS_PASSWORD=infini_rag_flow
 SVR_HTTP_PORT=9380
 
 # The RAGFlow Docker image to download.
-# Defaults to the v0.19.0-slim edition, which is the RAGFlow Docker image without embedding models.
-RAGFLOW_IMAGE=infiniflow/ragflow:v0.19.0-slim
+# Defaults to the v0.19.1-slim edition, which is the RAGFlow Docker image without embedding models.
+RAGFLOW_IMAGE=infiniflow/ragflow:v0.19.1-slim
 #
 # To download the RAGFlow Docker image with embedding models, uncomment the following line instead:
-# RAGFLOW_IMAGE=infiniflow/ragflow:v0.19.0
+# RAGFLOW_IMAGE=infiniflow/ragflow:v0.19.1
 #
-# The Docker image of the v0.19.0 edition includes built-in embedding models:
+# The Docker image of the v0.19.1 edition includes built-in embedding models:
 #   - BAAI/bge-large-zh-v1.5
 #   - maidalun1020/bce-embedding-base_v1
 #