Updating pub/sub emulator to latest version

[joehan]

Description

Updating pub/sub emulator to pick up some vulnerability fixes.

[gemini-code-assist]

Summary of Changes

Hello @joehan, 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 enhancing the security and stability of the development environment by upgrading the Google Cloud Pub/Sub emulator to its latest version. The primary goal is to integrate critical vulnerability fixes, ensuring that local testing and development workflows benefit from the most secure and up-to-date emulator build. The changes involve updating the configuration details that govern the emulator's download and usage.

Highlights

• Pub/Sub Emulator Update: The Google Cloud Pub/Sub emulator has been updated to version 0.8.17.
• Vulnerability Fixes: This update specifically addresses and includes important vulnerability fixes for the emulator.
• Configuration Metadata: The downloadableEmulatorInfo.json file has been updated to reflect the new emulator version, including its size, checksums, and download URLs.
• Changelog Entry: A new entry has been added to the CHANGELOG.md to document this emulator update and its purpose.

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[gemini-code-assist]

Code Review

This pull request updates the Pub/Sub emulator to version 0.8.17 to incorporate vulnerability fixes. The changes correctly update the emulator's configuration in downloadableEmulatorInfo.json and add an entry to CHANGELOG.md. The changes look good. I've added one suggestion to improve the maintainability of the emulator configuration to make future updates less error-prone.