Update dependency @langchain/core to v0.2.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@langchain/core (source)	0.2.7 -> 0.2.8

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Release Notes

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

### [`v0.2.8`](https://togithub.com/langchain-ai/langchainjs/compare/c323a5ad1e4a3c87a6b69d034d618acb1906039e...0fc87849e756685be78b4e1e7497c0300d97a3cd) [Compare Source](https://togithub.com/langchain-ai/langchainjs/compare/5a31cd82ab88cd04395dd08a5d1323a04be40835...91ec5ba129ece755d60f6ed33d35d7ef92e29bd8)

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Configuration

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