Fix build with CMake >= 4.0

[tgurr]

CMake Error at CMakeLists.txt:1 (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.

[VintageDesign]

Seeing as the owner of this project hasn't shown activity since 2020... I dont think we are gonna get this merged...

[vermaete]

Thanks: see https://github.com/ros/meta-ros/pull/1466