QWizard, setPixmap does not allow `str` for image path

Updating our toolkit to PySide6 in support of Unreal Engine and our production tools we started getting errors on classes deriving from QWizard on their post initialization. We traced the problem down to calls to `setPixmap` which were error out due to unsupported signatures. We're passing a WizardPixmap enum value and a string with the path to an known image.

Confirmed and reproduced the problem with the following code in a python interpreter

```

from PySide6 import QtWidgets, QtGui

app = QtWidgets.QApplication([])

wiz = QtWidgets.QWizard()

path = 'some_path_to_an_image.jpg'

wiz.setPixmap(QtWidgets.QWizard.BannerPixmap, path)

```

This will raise an exception, instead doing this:

```

pixmap = QtGui.QPixmap(path)

wiz.setPixmap(QtWidgets.QWizard.BannerPixmap, pixmap)

```

Will not.