Use versionless Qt cmake target

This makes it easier to build against both Qt5 and Qt6

GIT_SILENT

src/CMakeLists.txt

@@ -49,10 +49,10 @@ endif()
 
 add_library(plasma-volume-declarative SHARED ${dbus_SRCS} ${cpp_SRCS} ${qml_SRCS})
 target_link_libraries(plasma-volume-declarative
-    Qt5::Core
-    Qt5::Gui
-    Qt5::DBus
-    Qt5::Quick
+    Qt::Core
+    Qt::Gui
+    Qt::DBus
+    Qt::Quick
     KF5::GlobalAccel
     KF5::I18n
     KF5::Notifications

src/kcm/CMakeLists.txt

@@ -3,7 +3,7 @@ add_library(kcm_pulseaudio MODULE module.cpp)
 target_include_directories(kcm_pulseaudio PRIVATE ${CMAKE_BINARY_DIR})
 
 target_link_libraries(kcm_pulseaudio
-    Qt5::Quick
+    Qt::Quick
     KF5::CoreAddons
     KF5::Declarative
     KF5::I18n