fix: change client_secret to client_confirmation (security recommendation)

[ask-sdk]

Description

change the client_secrect to client_confirmation in order to address security recommendation.

Motivation and Context

Addresses security recommendation

Testing

Not sure how to test this change

Types of changes

• [ X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [X] My code follows the code style of this project
• [ ] My change requires a change to the documentation
• [ ] I have updated the documentation accordingly
• [X] I have read the README document
• [ ] I have added tests to cover my changes
• [ ] All new and existing tests passed
• [X] My commit message follows Conventional Commit Guideline

License

• [X] By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[ShenChen93]

Looks like unit test fail... I guess there's other places in code also use this Auth object

[github-actions[bot]]

This pr is stale since it has been open for 14 days with no activity. Please respond or this pr will be closed soon.