Remove Node 16

[vbudovski]

Node 16 has been EoL for a long time (2023-09-11)! Node 18 is going to be EoL very soon too (2025-04-30).
https://github.com/nodejs/Release

[DarkGL]

#1224 (comment)

[vbudovski]

It's ultimately your call as the maintainer of this library, but consider the maintenance overhead of keeping an ever-growing list of out-of-date Node versions around. The packages you depend on will start removing Node 16 support, if they haven't already, so you'll be stuck on ancient versions of packages if you choose to continue supporting it. You're already getting warnings from NPM about incompatibilities, and this will only grow.

npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'rimraf@6.0.1',
npm WARN EBADENGINE   required: { node: '20 || >=22' },
npm WARN EBADENGINE   current: { node: 'v16.20.2', npm: '8.19.4' }
npm WARN EBADENGINE }

[DarkGL]

Unfortunately, Node.js 16 is still used in the wild

https://nodedownloads.nodeland.dev/