[Snyk] Security upgrade langchain from 0.1.37 to 0.2.0

[twilio-product-security]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• ai-assistants-samples/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Deserialization of Untrusted Data SNYK-JS-LANGCHAINCORE-14563113	221

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