chore: Update express dependency to version 5.2.1

[LukeSchlangen]

Description

Fixes #

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[gemini-code-assist]

Summary of Changes

Hello @LukeSchlangen, I'm Gemini Code Assist¹! 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 focuses on a routine maintenance task, updating the express dependency to its latest stable version, 5.2.1. This ensures the project benefits from the most recent features, performance improvements, and security patches provided by the framework, maintaining compatibility and stability.

Highlights

• Dependency Update: The express dependency has been updated from version ^4.17.1 to ^5.2.1 in run/helloworld/package.json.

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[gemini-code-assist]

Code Review

This pull request attempts to update the express dependency to version 5.2.1. However, this version does not exist on the public npm registry, which would cause the installation to fail. Moreover, Express v5 is still in a pre-release state and is not suitable for sample applications. My review includes a critical comment with a suggestion to update to the latest stable version of Express v4 instead, which will resolve the issue and follow best practices for sample code.

[gemini-code-assist]

The specified version 5.2.1 for the express package does not exist on the public npm registry, which will cause npm install to fail.

Additionally, Express v5 is still in a pre-release stage and is not considered stable. For sample code, it's crucial to use stable, production-ready dependencies.

Please update to the latest stable version of Express v4.

Suggested change

	"express": "^5.2.1"
	"express": "^4.19.2"

[LukeSchlangen]

Hold on. I think this might be the wrong file for the Quickstart.