Argument re-typing code references possibly undefined imports (Python)

### Describe the bug

Struct argument dependencies imported from other modules seem to be aliased in the generated Python code, eg.

```python
from ..bundler import ExampleBundlingProps as _ExampleBundlingProps_99400d43
```

If used as (optional) members of other property classes, they are being correctly referenced by alias in constructor parameters:

```python
class ExampleLayerProps(aws_cdk.aws_lambda.LayerVersionOptions):
def __init__(
self,
*,
bundling_props: typing.Optional[_ExampleBundlingProps_99400d43] = None,
) -> None:
```

but the `dict` re-typing code that's inside that same constructor, is using the original name instead of an alias:

```python
if isinstance(bundling_props, dict):
bundling_props = ExampleBundlingProps(**bundling_props)
```

which, once a value is actually passed in, results in an error:

```
NameError: name 'ExampleBundlingProps' is not defined
```

### Expected Behavior

The re-typing code should be aware of import aliasing:

```python
if isinstance(bundling_props, dict):
bundling_props = _ExampleBundlingProps_99400d43(**bundling_props)
```

### Current Behavior

This [bit of code](https://github.com/aws/jsii/blob/e9d4084d06cd2611e4ff25cc7533f823878d1281/packages/jsii-pacmak/lib/targets/python.ts#L1118-L1128) that generates re-typing logic, seems to be unaware of the alias and tries to instantiate the struct by its original name.

### Reproduction Steps

Import a Props struct from a sibling module and use it as an optional parameter in another Props interface, eg.:

```typescript
import { LayerVersionOptions } from "aws-cdk-lib/aws-lambda";
import { Construct } from "constructs";
import { ExampleBundlingProps } from "../bundler";

/**
* Constructor properties for the Lambda layer construct
*/
export interface ExampleLayerProps extends LayerVersionOptions {
/**
* Bundling options for the function.
* @default no bundling props
*/
readonly bundlingProps?: ExampleBundlingProps;
}

/**
* CDK construct for ExampleLayer
*/
export class ExampleLayer extends LayerVersion {
constructor(scope: Construct, id: string, props: ExampleLayerProps) {
...
}
}
```

and inspect the generated code.

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### SDK version used

jsii 1.70.0

### Environment details (OS name and version, etc.)

OS independent

Start in packages/jsii-pacmak/lib/targets/python.ts at the re-typing logic linked in the issue, and reproduce the sibling-module Props case to inspect the generated Python. Trace how the aliased import is represented, then verify that dictionary re-typing uses the same alias and no longer raises the shown NameError.

Written by the indexing model from the issue text.