Update dependency langchain to v0.2.19 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
langchain (source)	0.2.18 -> 0.2.19

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Release Notes

langchain-ai/langchainjs (langchain)

### [`v0.2.19`](https://redirect.github.com/langchain-ai/langchainjs/compare/613b250120bf9cb96219bf4068ef45d8b9cf1bed...0ecbe89a0050edb3ccf5dd9445e205f15fda29e7) [Compare Source](https://redirect.github.com/langchain-ai/langchainjs/compare/0.2.18...0.2.19)

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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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• [ ] If you want to rebase/retry this PR, check this box

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