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

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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)

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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