Update dependency langchain to v0.2.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
langchain (source)	0.2.6 -> 0.2.7

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Release Notes

langchain-ai/langchainjs (langchain)

### [`v0.2.7`](https://togithub.com/langchain-ai/langchainjs/compare/0.2.6...5a31cd82ab88cd04395dd08a5d1323a04be40835) [Compare Source](https://togithub.com/langchain-ai/langchainjs/compare/0.2.6...0.2.7)

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Configuration

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