Update dependency @langchain/core to v0.2.12

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@langchain/core (source)	0.2.11 -> 0.2.12

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Release Notes

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

### [`v0.2.12`](https://togithub.com/langchain-ai/langchainjs/compare/db470a22138450a50cd7d04132a79b681a14ec1d...8dcd6f83adc2da964c5950b76ff418760c151619) [Compare Source](https://togithub.com/langchain-ai/langchainjs/compare/db470a22138450a50cd7d04132a79b681a14ec1d...8dcd6f83adc2da964c5950b76ff418760c151619)

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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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