Detach QPixmap instance before returning

Author: radarhere

src/PIL/ImageQt.py

@@ -213,4 +213,6 @@ def toqimage(im: Image.Image | str | QByteArray) -> ImageQt:
 
 def toqpixmap(im: Image.Image | str | QByteArray) -> QPixmap:
     qimage = toqimage(im)
-    return getattr(QPixmap, "fromImage")(qimage)
+    pixmap = getattr(QPixmap, "fromImage")(qimage)
+    pixmap.detach()
+    return pixmap