chore(deps): update dependency langchain_openai to v1.6.1

Author: renovate[bot]

.config/python/dev/requirements.txt

@@ -33,7 +33,7 @@ langchain_anthropic==1.7.1
 langchain_deepseek==1.1.0
 langchain_google_genai==4.4.0
 langchain_mistralai==1.1.6
-langchain_openai==1.6.0
+langchain_openai==1.6.1
 langchain_community==0.4.2
 langsmith==0.12.1
 orjson==3.12.0