{AKS}: bump upstream aks-agent to v0.5.0

[mainred]

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[yonzhan]

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

[github-actions]

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[mainred]

cc @nthevenin

[Copilot]

Pull request overview

This PR updates the aks-agent Azure CLI extension release metadata to reflect a new beta release intended to bump the bundled upstream aks-agent version.

Changes:

• Bump extension package version to 1.0.0b20 in setup.py.
• Add 1.0.0b20 entry to HISTORY.rst describing an upstream aks-agent bump to v0.5.0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/aks-agent/setup.py	Updates the extension package version to 1.0.0b20.
src/aks-agent/HISTORY.rst	Adds release notes for 1.0.0b20 (claims aks-agent bump to v0.5.0).

[github-actions]

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

[mainred]

cc @yanzhudd, please help merge the PR after it's approved. It's a simple bump version change. Thanks

[azclibot]

[Release] Update index.json for extension [ aks-agent-1.0.0b20 ] : https://dev.azure.com/msazure/One/_build/results?buildId=156611598&view=results