chore: fix stepfunctions import

[GavinZZ]

Issue # (if applicable)

N/A

Reason for this change

JSII docbuild to python fails due to MRC issue since MapBaseOptions already inherits AssignableStateOptions

Description of changes

Remove duplicate imports

Describe any new or updated permissions being added

Description of how you validated changes

N/A

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.17%. Comparing base (1b116b9) to head (a24acd0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33529   +/-   ##
=======================================
  Coverage   82.17%   82.17%           
=======================================
  Files         119      119           
  Lines        6862     6862           
  Branches     1158     1158           
=======================================
  Hits         5639     5639           
  Misses       1120     1120           
  Partials      103      103           

Flag	Coverage Δ
suite.unit	82.17% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.17% <ø> (ø)

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This pull request has been removed from the queue for the following reason: pull request dequeued.

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: e411ccc
• Result: SUCCEEDED
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