WL#17088 Langchain Forward Compatibility [POSTFIX]

Issue:
The upcoming langchain v1.0.0 changes some import paths.

Solution:
Update the code to try both old and new import paths for backwards and
forwards compatibility.

Change-Id: Ieadb8e80c4370c9be972310dda4ad04aa4df0f60

Author: GregorySHowe

mysql-connector-python/lib/mysql/ai/genai/generation.py

@@ -30,7 +30,10 @@
 
 from typing import Any, List, Optional
 
-from langchain.llms.base import LLM
+try:
+    from langchain_core.language_models.llms import LLM
+except ImportError:
+    from langchain.llms.base import LLM
 from mysql.ai.utils import atomic_transaction, execute_sql, format_value_sql
 from pydantic import PrivateAttr