0.17 requires Python 3.10, but docs state it is a minimum requirement

[dkouba-atym]

I have been having some intermittent issues with my compile process hanging. I believe this to be a combination of a couple things:

1. The 0.17 SDK is hard-linked against Python 3.10, but I did not have 3.10 installed.
2. During compile, a call to /Users/dankouba/zephyr-sdk-0.17.4/arm-zephyr-eabi/bin/arm-zephyr-eabi-gdb-py --configuration is issued. Without Python 3.10 installed, this call issues an error. When run inside of VSCode, this call never aborts and hangs indefinitely. Outside of VSCode, it aborts as one would expect.

The VSCode issue is something I need to investigate separately, however:

• The documentation specifies Python 3.10 is a minimum version, not a required version, and the required version is not included with the SDK and thus relies on the host's installed version. The failure is silent, and it took quite a bit of digging to uncover this. At minimum the docs should be updated to specify a minimum version and it should be enforced at install and/or runtime.
• I don't understand why there is a call to arm-zephyr-eabi-gdb-py during compilation. What is the purpose of this?

[stephanosio]

Outside of VSCode, it aborts as one would expect.

That is not how it is supposed to work though -- it is supposed to automatically fall back to the Python-less GDB (i.e. arm-zephyr-eabi-gdb) when the Python-capable GDB fails to launch for whatever reason.

From zephyrproject-rtos/zephyr@3363c64:

This commit updates the CMake toolchain detection routine to attempt
using the Python-capable GDB variant (gdb-py) first and, if it is not
available or fails to launch due to a missing libpython dependency,
use the Python-less GDB variant (gdb).