Update prototype extension to 0.2.1b5

[a11smiles]

Summary

Automated index update for the az prototype extension.

• Version: 0.2.1b5
• SHA-256: d80ebd09a849440a7f5200a4bf3e32693132835fb97c169a8ff0db6f51fb7c08
• Download: https://github.com/Azure/az-prototype/releases/download/v0.2.1b5/prototype-0.2.1b5-py3-none-any.whl
• Source release: https://github.com/Azure/az-prototype/releases/tag/v0.2.1b5

[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @a11smiles,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions]

The git hooks are available for azure-cli and azure-cli-extensions repos. They could help you run required checks before creating the PR.

Please sync the latest code with latest dev branch (for azure-cli) or main branch (for azure-cli-extensions).
After that please run the following commands to enable git hooks:

pip install azdev --upgrade
azdev setup -c <your azure-cli repo path> -r <your azure-cli-extensions repo path>

[github-actions]

• For more info about extension versioning, please refer to Extension version schema

[Copilot]

Pull request overview

Updates the Azure CLI extensions index entry for the prototype extension to reference a new pre-release build, ensuring the index points to the correct artifact and metadata.

Changes:

• Bump prototype extension version from 0.2.1b4 to 0.2.1b5.
• Update the downloadUrl, filename, and sha256Digest to match the new release artifact.

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[Copilot]

The final closing brace has a leading space (" }"), which is inconsistent with the opening brace at column 1 and creates unnecessary diff noise. Please remove the leading whitespace so the root-level closing } is unindented.