Update dependency langchain-openai to v0.3.12 (#2131)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [langchain-openai](https://redirect.github.com/langchain-ai/langchain)
([changelog](https://redirect.github.com/langchain-ai/langchain/releases?q=tag%3A%22langchain-openai%3D%3D0%22&expanded=true))
| dependencies | patch | `0.3.7` -> `0.3.12` |

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