chore: update issue-label-assign.yml to add cli-lib-alpha

[khushail]

Issue # (if applicable) - N/A

Closes #- N/A

Reason for this change

Update issue-label-assign.yml to add cli-lib-alpha.

Description of changes

Update issue-label-assign.yml to add cli-lib-alpha.

Description of how you validated changes

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 852e855
• Result: SUCCEEDED
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