cmake: Set minimum required version to 3.5 for CMake 4+ compatibility

[bkuhls]

Fixes build error with cmake 4:

CMake Error at _deps/eabase-src/CMakeLists.txt:4 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from 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.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

[bkuhls]

Fixes #14

[BendedWills]

I second this. Trying to use EASTL in a project and running into the CMake error.