Update dependency @langchain/core to v0.2.18

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@langchain/core (source)	0.2.17 -> 0.2.18

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Release Notes

langchain-ai/langchainjs (@​langchain/core)

### [`v0.2.18`](https://togithub.com/langchain-ai/langchainjs/compare/46557889ea40e8136adcabda32ebe36fcff19c69...089f389a5a938150c0865a334a72956d4d7e943d) [Compare Source](https://togithub.com/langchain-ai/langchainjs/compare/46557889ea40e8136adcabda32ebe36fcff19c69...089f389a5a938150c0865a334a72956d4d7e943d)

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Configuration

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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