Fix the kholidays detection with older CMake versions.

KF5AlarmCalendarConfig.cmake.in

@@ -3,7 +3,7 @@
 include(CMakeFindDependencyMacro)
 find_dependency(KF5Akonadi "@AKONADI_LIB_VERSION@")
 find_dependency(KF5IdentityManagement "@IDENTITYMANAGER_LIB_VERSION@")
-find_dependency(KF5Holidays "@HOLIDAY_LIB_VERSION@")
+find_dependency(KF5Holidays "@KF5_MIN_VERSION@")
 find_dependency(KF5CalendarCore "@CALENDARCORE_LIB_VERSION@")
 
 include("${CMAKE_CURRENT_LIST_DIR}/KF5AlarmCalendarTargets.cmake")