title: PyQt6: AttributeError: type object 'QImage' has no attribute 'Format_RGB888'
body: <p>I'm trying to port a code from PyQt5 to PyQt6, but the following error occur:</p>
  <pre><code>AttributeError: type object 'QImage' has no attribute 'Format_RGB888'
  </code></pre>
  <p>It happens with any Format_*, although in the PyQt6 QImage documentation these formats are present.</p>
  <p>Python 3.9 installed with miniforge, Mac M1 with OS X 11.5.2</p>
  <p>Thanks.</p>