Update prototype extension to 0.2.1b6

[a11smiles]

Summary

Automated index update for the az prototype extension.

• Version: 0.2.1b6
• SHA-256: a4bf67ad84289b00ab1bf3ae60753ed60f9a147174111b64980a84398f9a9e6f
• Download: https://github.com/Azure/az-prototype/releases/download/v0.2.1b6/prototype-0.2.1b6-py3-none-any.whl
• Source release: https://github.com/Azure/az-prototype/releases/tag/v0.2.1b6

[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 extension index entry for the az prototype extension to reference the newly released wheel version 0.2.1b6, ensuring the Azure CLI extensions feed points to the correct artifact and checksum.

Changes:

• Bumped prototype extension downloadUrl/filename to 0.2.1b6.
• Updated prototype extension version field to 0.2.1b6.
• Updated sha256Digest to match the new wheel.