message: CMake detects python3.11, which is not the system default
diff: @@ -3,18 +3,13 @@ cmake_minimum_required(VERSION 3.13)
  project(external-mavlink)
  include(ExternalProject)
  -# Without this GitHub actions picks the wrong python3 executable.
  -set(Python3_FIND_REGISTRY "NEVER")
  -find_package(Python3 COMPONENTS Interpreter REQUIRED)
  -
  if (NOT MAVLINK_DIALECT)
  set(MAVLINK_DIALECT common)
  endif()
  -
  if(NOT CMAKE_CROSSCOMPILING)
  set(CONFIGURE_COMMAND
  - Python3::Interpreter -m pip install -r pymavlink/requirements.txt)
  + python3 -m pip install -r pymavlink/requirements.txt)
  endif()
  ExternalProject_add(
  @@ -23,7 +18,7 @@ ExternalProject_add(
  GIT_TAG c65c498efd2d9673e1d7da37025686daa5a7d568
  PREFIX mavlink
  CONFIGURE_COMMAND ${CONFIGURE_COMMAND}
  - COMMAND Python3::Interpreter
  + COMMAND python3
  -m pymavlink.tools.mavgen
  --lang=C
  --wire-protocol=2.0
  