Update dependency @langchain/core to v0.2.7

[renovate[bot]]

This PR contains the following updates:

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

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Release Notes

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

### [`v0.2.7`](https://togithub.com/langchain-ai/langchainjs/compare/a728820c9a104ed83a1e25ebc7f3d6dc570f5e01...5a31cd82ab88cd04395dd08a5d1323a04be40835) [Compare Source](https://togithub.com/langchain-ai/langchainjs/compare/a728820c9a104ed83a1e25ebc7f3d6dc570f5e01...5a31cd82ab88cd04395dd08a5d1323a04be40835)

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

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

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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