Use versionless Qt cmake target

This makes it easier to build against both Qt5 and Qt6

GIT_SILENT

autotests/CMakeLists.txt

 macro(KHOTKEYS_UNIT_TESTS)
        foreach(_testname ${ARGN})
                kde4_add_unit_test(${_testname} NOGUI ${_testname}.cpp)
-               target_link_libraries(${_testname} khotkeysprivate  Qt5::Test)
+               target_link_libraries(${_testname} khotkeysprivate  Qt::Test)
        endforeach(_testname)
 endmacro(KHOTKEYS_UNIT_TESTS)
 

kcm_hotkeys/CMakeLists.txt

@@ -97,7 +97,7 @@ target_link_libraries(
     KF5::KIOWidgets
     KF5::TextWidgets
     KF5::KDELibs4Support
-    Qt5::Gui
+    Qt::Gui
     ${X11_X11_LIB}
     )
 

libkhotkeysprivate/CMakeLists.txt

@@ -73,7 +73,7 @@ add_library(khotkeysprivate SHARED ${khotkeysprivate_SRCS})
 # Not exported, so just make all links PUBLIC
 target_link_libraries(khotkeysprivate PUBLIC
     PW::KWorkspace
-    Qt5::X11Extras
+    Qt::X11Extras
     KF5::GlobalAccel
     KF5::I18n
     KF5::KIOCore