Move var from rag.settings to common.globals (#11022)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

rag/utils/s3_conn.py

@@ -21,13 +21,14 @@ from botocore.config import Config
 import time
 from io import BytesIO
 from common.decorator import singleton
-from rag import settings
+from common import globals
+
 
 @singleton
 class RAGFlowS3:
     def __init__(self):
         self.conn = None
-        self.s3_config = settings.S3
+        self.s3_config = globals.S3
         self.access_key = self.s3_config.get('access_key', None)
         self.secret_key = self.s3_config.get('secret_key', None)
         self.session_token = self.s3_config.get('session_token', None)