Update dependencies on 'dev' in qt/qtquickcontrols2 fails

agent:2021/07/29 02:50:28 build.go:391: CMake Error at /home/qt/work/install/lib/cmake/Qt6/QtTargetHelpers.cmake:152 (add_library):
agent:2021/07/29 02:50:28 build.go:391:   add_library cannot create ALIAS target "Qt::QuickTemplates2" because
agent:2021/07/29 02:50:28 build.go:391:   another target with the same name already exists.
agent:2021/07/29 02:50:28 build.go:391: Call Stack (most recent call first):
agent:2021/07/29 02:50:28 build.go:391:   /home/qt/work/install/lib/cmake/Qt6/QtModuleHelpers.cmake:209 (qt_internal_add_target_aliases)
agent:2021/07/29 02:50:28 build.go:391:   /home/qt/work/install/lib/cmake/Qt6Qml/Qt6QmlBuildInternals.cmake:166 (qt_internal_add_module)
agent:2021/07/29 02:50:28 build.go:391:   src/quicktemplates2/CMakeLists.txt:5 (qt_internal_add_qml_module)