security/vuxml: Add www/qt6-webengine
qt6-webengine < 6.6.1 is also affected by the following VuXML IDs:
- 6d9c6aae-5eb1-11ee-8290-a8a1599412c6
- 07ee8c14-68f1-11ee-8290-a8a1599412c6
- a1e27775-7a61-11ee-8290-a8a1599412c6
- 0da4db89-84bf-11ee-8290-a8a1599412c6