Fix Python 3.9 module import race condition in contract tests

Add eager import of utils.retries module to prevent KeyError in module
lock when templates.py triggers lazy import via __getattr__. This is a
known Python 3.9 issue with nested imports that was fixed in 3.10+.

The urllib3 upgrade changed import timing enough to expose this latent
bug in the lazy loading mechanism.

Author: lawrence-u10d

_test_contract/conftest.py

@@ -7,6 +7,10 @@
 
 from unstructured_client import UnstructuredClient, utils
 
+# Python 3.9 workaround: eagerly import retries to avoid lazy import race condition
+# This prevents a KeyError in module lock when templates.py triggers lazy import of utils.retries
+from unstructured_client.utils import retries  # noqa: F401
+
 FAKE_API_KEY = "91pmLBeETAbXCpNylRsLq11FdiZPTk"