Role: Python type checking fails on Role is not assignable to IRole

### Describe the bug

I'm using `ty` for type checking my python cdk code. There's an issue with the following:
```python
error[invalid-assignment]: Object of type `Role` is not assignable to `IRole`
--> cdk_stack.py:74:15
|
74 | role: iam.IRole = iam.Role(
| _______________---------___^
| | |
| | Declared type
75 | | self,
76 | | "MyRole",
77 | | assumed_by=iam.ServicePrincipal("lambda.amazonaws.com"),
78 | | role_name="MyRole",
79 | | )
| |_________^ Incompatible value of type `Role`
80 |
|
info: rule `invalid-assignment` is enabled by default

Found 1 diagnostic
```
The `Role` class implements
```python
@jsii.member(jsii_name="grantAssumeRole")
def grant_assume_role(self, identity: "IPrincipal") -> "Grant":
...
```
Whereas the `IRole` protocol has this:
```python
@jsii.member(jsii_name="grantAssumeRole")
def grant_assume_role(self, grantee: "IPrincipal") -> "Grant":
```

### Regression Issue

- [ ] Select this option if this issue appears to be a regression.

### Last Known Working CDK Library Version

N/A

### Expected Behavior

I expect the type checker to be happy and let me assign iam.Role() to a variable typed with iam.IPrincipal.

### Current Behavior

Currently the type checker `ty` reports this as an error, because of the difference in the argument defined in the `grant_assume_role()` function.

### Reproduction Steps

```python
from aws_cdk import Stack
from aws_cdk import aws_iam as iam

class CdkStack(Stack):
def __init__(self, scope, construct_id, **kwargs):
super().__init__(scope, construct_id, **kwargs)
role: iam.IRole = iam.Role(
self, "MyRole", assumed_by=iam.ServicePrincipal("lambda.amazonaws.com"), role_name="MyRole"
)
```
Run `ty check` on the code, and notice the reported errors.

### Possible Solution

Rename the Role.grant_assume_role() function parameter to make Role compatible with the IRole protocol.

### Additional Information/Context

_No response_

### AWS CDK Library version (aws-cdk-lib)

2.246.0

### AWS CDK CLI version

2.1104.0 (build 203898c)

### Node.js Version

v22.12.0

### OS

Pop!_OS 24.04 LTS, Linux 6.18.7-76061807-generic x86_64 GNU/Linux

### Language

Python

### Language Version

Python 3.12.3

### Other information

_No response_

Start with the cdk_stack.py reproduction and run ty check to confirm the invalid-assignment diagnostic. Compare the shown Role and IRole grant_assume_role declarations, then make the parameter naming compatible so the iam.Role() assignment succeeds without the reported error.

Written by the indexing model from the issue text.