fix: enable s3fs cache_regions for bucket region detection (#582)

## Problem

New S3 buckets in different regions fail with `UserAuthError: Access
Denied` until AWS DNS/routing converges (2-3 hours) when you try to
connect with the wrong region (i.e. use `us-east-1` for a bucket in
`us-east-2`).

## Solution

Enable `cache_regions=True` in s3fs configuration to handle AWS region
redirects automatically.

**Before:** Bucket access fails immediately, works after hours of
waiting
**After:** Bucket access works immediately regardless of region

Author: CyMule

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.2.9
+
+**Fix**: enable s3fs cache_regions for bucket region detection
+
 ## 1.2.8
 
 **Fix**: Fix artifact url

unstructured_ingest/__version__.py

@@ -1 +1 @@
-__version__ = "1.2.8"  # pragma: no cover
+__version__ = "1.2.9"  # pragma: no cover

unstructured_ingest/processes/connectors/fsspec/s3.py

@@ -118,6 +118,9 @@ def get_access_config(self) -> dict[str, Any]:
         if self.endpoint_url:
             access_configs["endpoint_url"] = self.endpoint_url
 
+        # This allows s3fs to properly follow AWS region redirects
+        access_configs["cache_regions"] = True
+
         return access_configs
 
     @requires_dependencies(["s3fs", "fsspec"], extras="s3")