Add Llama3.3 (#4174)

### What problem does this PR solve?

#4168

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

rag/utils/s3_conn.py

@@ -1,6 +1,5 @@
 import logging
 import boto3
-import os
 from botocore.exceptions import ClientError
 from botocore.client import Config
 import time