Link gdb-py against Python 3.10

[stephanosio]

Zephyr SDK's Python scripting-enabled GDB currently links against libpython3.8.

sdk-ng/.github/workflows/ci.yml

Lines 716 to 718 in 2d488e6

	# Use Python 3.8 for non-Canadian Linux and macOS builds
	cat <<EOF >> .config
	CT_GDB_CROSS_PYTHON_BINARY="python3.8"

Since Zephyr is updating the minimum Python version requirement to 3.10, update the Zephyr SDK gdb-py to also link against libpython3.10.