chore(appengine): Update flex hello-world app outdated dependencies

[amcolin]

Description

Fixes Internal: b/475332227

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• 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 sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners 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

[gemini-code-assist]

Summary of Changes

Hello @amcolin, 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 maintaining the hello-world sample for App Engine flexible environment by updating its core dependencies. The changes ensure the application runs with more recent and supported versions of Python packages and runtime configurations, addressing an internal tracking issue related to outdated dependencies.

Highlights

• Runtime Configuration Update: The app.yaml file has been updated to explicitly specify runtime_version: 3.14 for the App Engine flexible environment.
• Dependency Version Bumps: The requirements.txt file now uses updated versions for Flask (>=3.1.0) and Gunicorn (>=25.0.0), and simplifies the version specifiers.

Changelog

• appengine/flexible/hello_world/app.yaml
  • Added runtime_version: 3.14 to the runtime_config section.
• appengine/flexible/hello_world/requirements.txt
  • Updated Flask to Flask>=3.1.0.
  • Updated Gunicorn to gunicorn>=25.0.0.
  • Removed specific version pinning for Werkzeug and conditional Flask/Werkzeug versions for Python 3.6/3.7, simplifying the dependency list.

Activity

• The pull request was created to fix an internal issue (b/475332227) regarding outdated dependencies.
• The author, amcolin, has provided a checklist indicating the status of various guidelines and tests, with several items pending.

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[gemini-code-assist]

Code Review

This pull request aims to update outdated dependencies for the App Engine flexible hello-world sample. While updating dependencies is a good practice, the versions specified for both the Python runtime in app.yaml and the packages in requirements.txt are not publicly available, which will cause deployment and installation to fail for users. I've added critical comments to address these issues by suggesting the use of valid, currently available versions.