Fix cmake 4.0 support #23
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Adding a policy_max version of 4.0 in cmake_minimum_required. This tells cmake that policy version up to 4.0 is supported without removing support for cmake <= 3.5.
CMake policy 4.0 support is tested based on local testing and this version only needs to be updated when a version of cmake comes out that drop 4.0 policy support (likely 5.0).