package.xml entries need to be updated for Qt6

[azeey]

The entries for Qt in our package.xml still point to Qt5 packages.

gz-sim/package.xml

Lines 34 to 43 in 0172411

	<depend>qml-module-qt-labs-folderlistmodel</depend>
	<depend>qml-module-qt-labs-settings</depend>
	<depend>qml-module-qtgraphicaleffects</depend>
	<depend>qml-module-qtquick-controls2</depend>
	<depend>qml-module-qtquick-controls</depend>
	<depend>qml-module-qtquick-dialogs</depend>
	<depend>qml-module-qtquick-layouts</depend>
	<depend>qml-module-qtquick2</depend>
	<depend>qtbase5-dev</depend>
	<depend>qtdeclarative5-dev</depend>

We'll also need to add rosdep keys for these in https://github.com/ros/rosdistro

[iche033]

Qt6 packages: ros/rosdistro#47214
QML6 packages: ros/rosdistro#47215

[iche033]

package.xml updates:

• gz-sim: Update Qt6 deps in package.xml #3025
• gz-gui: Update Qt6 deps in package.xml gz-gui#697