fix: Update thumbprints input variable to be a list with 2 items as default

[jreslock]

↪️ Pull Request

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📒 Description

🕶️ Types of changes

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

🤯 List of changes

GitHub has 2 thumbprints and the input variable should have them both as a default value.

Also fixing tflint warnings

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Checklist

• My code follows the code style of this project.
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• I followed the existing code standards and didn't mess up the formatting.
• My change requires a change to the documentation.
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[jreslock]

This is a duplicate of #35