refactor: remove no-op pass branch in process_items

Address Greptile review nit — the if + pass was a no-op since the
mutation was removed. Deleting the branch entirely.

litellm/llms/vertex_ai/common_utils.py

@@ -615,8 +615,6 @@ def process_items(schema, depth=0):
             f"Max depth of {DEFAULT_MAX_RECURSE_DEPTH} exceeded while processing schema. Please check the schema for excessive nesting."
         )
     if isinstance(schema, dict):
-        if "items" in schema and isinstance(schema["items"], dict) and _is_any_type_schema(schema["items"]):
-            pass  # preserve "any type" semantics — don't coerce to object
         for key, value in schema.items():
             if isinstance(value, dict):
                 process_items(value, depth + 1)