Pin simple-xml-to-json to 1.2.3 to fix global install crash (#23)

[dzucconi]

Fixes #23 — arena crashes on startup after a global install with:

SyntaxError: The requested module 'simple-xml-to-json' does not provide an export named 'default'

terminal-image → jimp → @jimp/plugin-print imports simple-xml-to-json as a default export:

import xmlPackage from "simple-xml-to-json";

simple-xml-to-json@1.2.5 dropped the default export (named exports only). Local builds work because the committed lockfile pins 1.2.3, but npm i -g @aredotna/cli has no lockfile and resolves the latest, which breaks.

TODO: Consider whether terminal-image is worth its dep weight long-term.