Inform CMake of compatibility with versions newer than 3.5

[itzexpoexpo]

Newer versions of CMake complain about version 3.5 being deprecated:

CMake Deprecation Warning at build/_deps/lyra-src/CMakeLists.txt:23 (cmake_minimum_required):
  Compatibility with CMake < 3.10 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

This patch just marks newer versions as supported, silencing this warning.

The ...<policy_max> syntax was added in 3.12 with earlier versions ignoring it, support for them should not be affected by this change.

[grafikrobot]

Can we just set the max to 4.999 (or appropriately large number to cover future 4.x versions)?

[itzexpoexpo]

CMake does not refuse that outright and it does silence the warning, but I'd avoid it.

If some future 4.x version introduces a policy change incompatible with lyra, it'd silently enable that change, potentially raising odd errors for the user.

I only have 3.31 at hand to test right now, but it should be fine for at least a few years