Update the syntax error of aws python promote or quarantine

[JimLin94]

Update the syntax error of aws python promote or quarantine

Change Summary

Purpose:

Fix the syntax error in the template(post-scan-actions/aws-python-promote-or-quarantine/template.yml).

Verify:

The SAM CLI is verified.

Deploy to CloudFormation is verified.

PR Checklist

• [ ] I've read and followed the Contributing Guide.
• Documents/Readmes
  • [ ] Updated accordingly
  • [ ] Not required
• Plugins that have versioning
  • [ ] Version bumped and follows Semantic Versioning
  • [ ] (Azure Only): Ensure the version for the package location in template.json has been updated
  • [ ] Not required

Other Notes

[kwan-su]

Verified