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 framework dependency. By moving to version 5.2.1, the project ensures it benefits from the latest features, performance improvements, and security patches provided by the express ecosystem, specifically within the helloworld sample application.

Highlights

• Dependency Update: The express dependency has been updated to version 5.2.1.
• File Affected: This update specifically targets the run/helloworld/package.docs.json file.

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[gemini-code-assist]

Code Review

This pull request only updates the express dependency in run/helloworld/package.docs.json. The main dependency file, run/helloworld/package.json, has not been updated and still references the old version of Express. This is a critical oversight, as the application will not use the updated dependency. Please update run/helloworld/package.json to complete the dependency upgrade.

[gemini-code-assist]

While this file is updated, the main package.json file for this sample (run/helloworld/package.json) has not been. As a result, the application will continue to use the old version of Express. Please update the dependency in run/helloworld/package.json as well.