Fix S3 client initialization with signature_version and addressing_style (#9911)

### What problem does this PR solve?

Moved `signature_version` and `addressing_style` parameters to a
`Config` object from `botocore.config`
`signature_version` is now passed as `Config(signature_version='v4')`
`addressing_style` is now passed as `Config(s3={'addressing_style':
'path'})`
The `Config` object is then passed to `boto3.client()` via the `config`
parameter



## Changes Made
- Modified `rag/utils/s3_conn.py` in the `__open__()` method
- Updated parameter handling logic to use `config_kwargs` dictionary
- Maintained backward compatibility for configurations without these
parameters



## Related Issue
Fixes #9910


### Type of change

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

Co-authored-by: Syed Shahmeer Ali <ashahmeer73@gmail.com>

Author: SyedShahmeerAli12

rag/utils/s3_conn.py

@@ -80,10 +80,13 @@ def __open__(self):
                 s3_params['region_name'] = self.region_name
             if self.endpoint_url:
                 s3_params['endpoint_url'] = self.endpoint_url
+            
+            # Configure signature_version and addressing_style through Config object
             if self.signature_version:
-                s3_params['signature_version'] = self.signature_version
+                config_kwargs['signature_version'] = self.signature_version
             if self.addressing_style:
-                s3_params['addressing_style'] = self.addressing_style
+                config_kwargs['s3'] = {'addressing_style': self.addressing_style}
+            
             if config_kwargs:
                 s3_params['config'] = Config(**config_kwargs)