chore(deps): update dependency langchain-google-vertexai to v3

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
langchain-google-vertexai (changelog)	==1.0.10 -> ==3.0.0

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[gemini-code-assist[bot]]

Summary of Changes

Hello @renovate-bot, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request performs a routine dependency update for langchain-google-vertexai to its latest major version, 3.0.0. This update, managed by Renovate, ensures that the project's dependencies are kept current, potentially introducing new features or critical fixes from the updated library. Reviewers should be aware that a major version change might necessitate code adjustments to accommodate any breaking changes in the langchain-google-vertexai library.

Highlights

• Dependency Update: The langchain-google-vertexai dependency has been updated across multiple requirements.txt files from version 1.0.10 to 3.0.0.
• Major Version Bump: This update constitutes a major version change, which typically indicates the introduction of breaking API changes that may require corresponding code modifications.

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