Match exact Qt versions for QtScxml and QtStateMachine

If pointed towards a different prefix for Qt, it's possible to have
QtScxml and QtStateMachine fall back to the system Qt which may be a
completely different version. This prevents an issues where you could be
building with Qt 6.5, and it falls back to system Qt 6.6 for example.

Fixes #893

CMakeLists.txt

@@ -480,9 +480,9 @@ endif()
 find_package(Qt${QT_VERSION_MAJOR}IviCore 1.1 NO_MODULE QUIET) # 1.1 is based on 5.8
 find_package(Qt${QT_VERSION_MAJOR}IviVehicleFunctions 1.1 NO_MODULE QUIET)
 find_package(Qt${QT_VERSION_MAJOR}IviMedia 1.1 NO_MODULE QUIET)
-find_package(Qt${QT_VERSION_MAJOR}Scxml 5.8 NO_MODULE QUIET)
+find_package(Qt${QT_VERSION_MAJOR}Scxml ${Qt${QT_VERSION_MAJOR}_VERSION} EXACT NO_MODULE QUIET)
 if(QT_VERSION_MAJOR GREATER_EQUAL 6)
-    find_package(Qt${QT_VERSION_MAJOR}StateMachine NO_MODULE QUIET)
+    find_package(Qt${QT_VERSION_MAJOR}StateMachine ${Qt${QT_VERSION_MAJOR}_VERSION} EXACT NO_MODULE QUIET)
 endif()
 
 # if translation/doc host tools are missing, the Qt5 cmake config files throw errors...