Use CMake version range to support LTO builds

Use of CMake's LTO support requires version 3.9 or newer and the
CMP0069 policy. As Geant4 10.6.3 only sets a minimum version of
3.8, LTO builds will never be enabled as the policy is never set.

Bump version range to 3.8...3.27 to allow LTO builds when a suitable
CMake version is used to build Geant4.

CMakeLists.txt

@@ -16,7 +16,7 @@ endif()
 #-----------------------------------------------------------------------
 # - Define CMake requirements and override make rules as needed
 #
-cmake_minimum_required(VERSION 3.8 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.8...3.27 FATAL_ERROR)
 
 # - Any policy requirements should go here