Increment version for ai releases

[azure-sdk]

Increment package version after release of azure-ai-projects

[Copilot]

Pull Request Overview

This PR increments the package version for azure-ai-projects after a release.

• Updated the version in the _version.py file from "1.0.0b8" to "1.0.0b9".
• Added a new "1.0.0b9 (Unreleased)" section in the CHANGELOG.md for documenting upcoming changes.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
sdk/ai/azure-ai-projects/azure/ai/projects/_version.py	Version bump to "1.0.0b9".
sdk/ai/azure-ai-projects/CHANGELOG.md	Added a new section for version "1.0.0b9".

[azure-sdk]

API change check

API changes are not detected in this pull request.

[github-actions]

Hi @azure-sdk. Thank you for your interest in helping to improve the Azure SDK experience and for your contribution. We've noticed that there hasn't been recent engagement on this pull request. If this is still an active work stream, please let us know by pushing some changes or leaving a comment. Otherwise, we'll close this out in 7 days.

[github-actions]

Hi @azure-sdk. Thank you for your contribution. Since there hasn't been recent engagement, we're going to close this out. Feel free to respond with a comment containing /reopen if you'd like to continue working on these changes. Please be sure to use the command to reopen or remove the no-recent-activity label; otherwise, this is likely to be closed again with the next cleanup pass.