Update dependency @langchain/core to v0.2.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@langchain/core (source)	0.2.5 -> 0.2.6

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Release Notes

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

### [`v0.2.6`](https://togithub.com/langchain-ai/langchainjs/compare/0.2.5...3b6f29de85ce32199bc285ea47b2676368f9c40a) [Compare Source](https://togithub.com/langchain-ai/langchainjs/compare/0.2.5...a728820c9a104ed83a1e25ebc7f3d6dc570f5e01)

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Configuration

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