chore: fix stepfunctions import (#33529)

### 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

<!-- What new or updated IAM permissions are needed to support the
changes being introduced ? -->


### Description of how you validated changes

N/A

### Checklist
- [ ] My code adheres to the [CONTRIBUTING
GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and
[DESIGN
GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: GavinZZ

packages/aws-cdk-lib/aws-stepfunctions/lib/states/map-base.ts

@@ -117,7 +117,7 @@ export interface MapBaseOptions extends AssignableStateOptions {
 /**
  * Properties for defining a Map state
  */
-export interface MapBaseProps extends StateBaseProps, AssignableStateOptions, MapBaseOptions, MapBaseJsonPathOptions, MapBaseJsonataOptions {}
+export interface MapBaseProps extends StateBaseProps, MapBaseOptions, MapBaseJsonPathOptions, MapBaseJsonataOptions {}
 
 /**
  * Returns true if the value passed is a positive integer