KMS-522: Fixed ARN for accessing step function.

[cgokey]

Overview

What is the feature?

I had some kind of circular reference when referring to the ARN for the step function. This change fixes that.

What is the Solution?

Updated serverless.yml in how it references ARN.

What areas of the application does this impact?

Deployment of this code.

Testing

The deployment should work now.

Checklist

• I have added automated tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.74%. Comparing base (92a42e1) to head (83369af).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files         120      120           
  Lines        1983     1983           
  Branches      473      473           
=======================================
  Hits         1978     1978           
  Misses          5        5           

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