fix: Make thumbprint a list, add defaults

[apanzerj]

↪️ Pull Request

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📒 Description

Github asks that you put two thumbprints in the OIDC config, and the thumbprint itself should be a list, not a string, since you can add up to 5 thumbprints.

https://github.blog/changelog/2023-06-27-github-actions-update-on-oidc-integration-with-aws/

🕶️ Types of changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Documentation
• Dependencies

🤯 List of changes

Make thumbprint a list

👫 Relationships

🔎 Review hints

🚨 Test instructions

Checklist

• [ x ] My code follows the code style of this project.
• [ x ] I have read the CONTRIBUTING document.
• [ x ] Added/updated unit tests for this change
• [ x ] I have tested the changes and verified that they work and don't break anything (as well as I can manage).
• [ x ] Filled out test instructions (In case there aren't any unit tests)
• [ x ] I followed the existing code standards and didn't mess up the formatting.
• [ x ] My change requires a change to the documentation.
• [ x ] I did my best to add documentation to any public classes or methods I added.
• [ x ] Included links to related issues/PRs

[apanzerj]

tagging @ivankatliarchuk for review

[apanzerj]

@ivankatliarchuk bump. Just wondering if you have time to review?