1.14.0 - regression bug: confusion of **kwargs with other parameters

Python 3.13
MacOS

Works in MyPy 1.13.0
Fails in MyPy 1.14.0

```python
class X:
    def __init__(self, msg: str, **variables: int) -> None:
         pass

X('test1', b=2)

# when executing with the generated .so library of MyPyC:
TypeError: argument for __init__() given by name ('msg') and position (1)
```