fix(deps): update dependency langchain-openai to v0.3.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
langchain-openai (changelog)	0.3.1 -> 0.3.4

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[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/examples
agent_react_custom.py	24	13	46%	61–99, 103–104
agent_structured.py	27	4	85%	80, 129–136
langgraph_agent_supervisor.py	69	43	38%	31–35, 41–53, 60–61, 74–105, 118–145, 149–178
langgraph_sample.py	35	3	91%	90–93
langgraph_self_reflection.py	107	11	90%	191–197, 219–220, 256–260
src/langchain
callback.py	19	4	79%	20, 47–49, 53
react_custom.py	80	16	80%	40–42, 132, 139, 157, 160, 164, 168, 188–201, 205
react_docstore.py	15	6	60%	29–39, 43–44
react_with_tool_and_llm.py	48	11	77%	59, 62, 66, 70, 90–112, 116
self_ask_with_search.py	19	7	63%	37–52
text_splitter.py	22	8	64%	21–27, 41–51
src/libs
agents.py	10	0	100%
llm.py	8	1	88%	14
tools.py	12	0	100%
src/projects/apps/streamlit
app.py	85	48	44%	29–30, 33–34, 38–107, 150–155, 166–167
TOTAL	580	175	70%

Tests	Skipped	Failures	Errors	Time
14	0 💤	0 ❌	0 🔥	9.596s ⏱️