ci: test on node 22

[btea]

Node 16 is already eof and version 22 is released, so we can update it.

[capricorn86]

@btea we need to change the "engines" property in the "package.json" files as well. However, this would be considered a breaking change and might be something better to combine with other breaking changes in a major release.

[btea]

Indeed, we should change the engine field to >=18.0.0.