Improve TS config to use recommended Node.js v18 configuration

[Clemens Pohle]

The only correct module settings for projects that intend to run in Node.js are node16 and nodenext.

https://www.typescriptlang.org/docs/handbook/modules/theory.html#the-module-output-format

Node.js v18 supports ES2023: https://node.green/#ES2023