fix(containers): Fix Python 3.10 compatibility for OpenAIContainerConfig

LiteLLM's pyproject.toml specifies `python = ">=3.9,<4.0"`, supporting
Python 3.9 and above. However, the OpenAIContainerConfig class was
failing to load on Python 3.10 with:

    TypeError: Cannot subclass typing.Any

This occurred because `BaseContainerConfig = Any` was used as a
runtime placeholder, and the class then inherited from it.

In Python 3.11+, subclassing `typing.Any` is allowed (added to support
dynamic classes like unittest.Mock where type checkers should skip
verification). However, in Python 3.10 and earlier, this raises a
TypeError.

The fix imports the actual BaseContainerConfig class at runtime instead
of using Any as a placeholder.

Fixes #19727

litellm/llms/openai/containers/transformation.py

@@ -29,7 +29,7 @@ if TYPE_CHECKING:
     BaseLLMException = _BaseLLMException
 else:
     LiteLLMLoggingObj = Any
-    BaseContainerConfig = Any
+    from ...base_llm.containers.transformation import BaseContainerConfig
     BaseLLMException = Any