Make it compile against qt6

CMakeLists.txt

@@ -9,7 +9,7 @@ set(RELEASE_SERVICE_VERSION "${RELEASE_SERVICE_VERSION_MAJOR}.${RELEASE_SERVICE_
 project(kcharselect VERSION ${RELEASE_SERVICE_VERSION})
 
 set (QT_MIN_VERSION "5.15.0")
-set (KF5_MIN_VERSION "5.85.0")
+set (KF5_MIN_VERSION "5.89.0")
 
 find_package (ECM ${KF5_MIN_VERSION} REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})
@@ -21,7 +21,7 @@ include(ECMSetupVersion)
 include(KDEClangFormat)
 include(KDEGitCommitHooks)
 
-find_package (Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
+find_package (Qt${QT_MAJOR_VERSION} ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
     Core
     Widgets
 )