fix: support older node version than 22.12.0

[Totto16]

Description

In #342 (8829de8 and 8a99348) I updated some dependencies, that our locale generation script uses. The updates made them ESM only. I used node v22.14.0 and I didn't notice any problem. But after investigating a failure reported in #347 I found out, that that broke support for older node version than 22.12.0. The reason for this is the following timeline:

node version	change	ref
v20.17.0	--experimental-require-module flag added, default false	ref
v22.0.0	--experimental-require-module flag added, default false	ref
v22.12.0	--experimental-require-module flag defaults to true	ref

The flag --experimental-require-module makes require() calls also support ESM modules, which we need, if we want to use the newest versions of some dependencies.

This feature is under active development, but it's stable in the LTS branches of node

So to fix this issue, I added NODE_OPTIONS='--experimental-require-module' in front of every ts-node call. I also guarded everything with an explicit engines field in the package.json. So we support only the node versions, where this feature can be enabled. I made the engines field strict, so that it can't be circumvented.

This shouldn't introduce problems, as we use node 22 in actions anyway, and we just use this to generate locales.

Fixes #347

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project
• My commits follow the commit standards of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have checked my code and corrected any misspellings