CMake 3.27+ warning

[AlexyPellegrini]

FindPythonLibs and PythonInterp have been "removed" from CMake 3.27+. They are, in fact, still working but throw a warning when used:

   CMake Warning (dev) at CMake/vtkWrapPython.cmake:187 (find_package):
        Policy CMP0148 is not set: The FindPythonInterp and FindPythonLibs modules
        are removed.  Run "cmake --help-policy CMP0148" for policy details.  Use
        the cmake_policy command to set the policy and suppress this warning.

      Call Stack (most recent call first):
        CMake/vtkMacroKitPythonWrap.cmake:165 (include)
        CMakeLists.txt:229 (vtkMacroKitPythonWrap)

They have been replaced by FindPython