cmake: detect highest python version installed

Macro for python detection was taking old version installed for
compatability (needed by the zephyr SDK for gdb). Make the macro detect
latest version installed instead.

Fixes zephyrproject-rtos#24252.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

cmake/python.cmake

@@ -16,7 +16,5 @@ endif()
 set(PythonInterp_FIND_VERSION 3.6)
 set(PythonInterp_FIND_VERSION_COUNT 2)
 set(PythonInterp_FIND_VERSION_MAJOR 3)
-set(PythonInterp_FIND_VERSION_MINOR 6)
-set(PythonInterp_FIND_VERSION_EXACT 0)
 set(PythonInterp_FIND_REQUIRED 1)
 include(${ZEPHYR_BASE}/cmake/backports/FindPythonInterp.cmake)