[Snyk] Upgrade langchain from 0.0.213 to 0.2.8#5

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Skrishnan586 wants to merge 1 commit intomainfrom snyk-upgrade-d98ecf2d5c816dbca2aa6cd2ee06493b

+148-459

Commits on Jul 22, 2024

fix: upgrade langchain from 0.0.213 to 0.2.8
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