fix(worker): Fix import error when using pkg with node v20

[nagyszabi]

Fixes: #143

[mcollina]

A test would be highly welcomed, if you can give it a shot. You might want to use spawn to execute pkg.

[nagyszabi]

I've created a test inside test/pkg which packages a tap test into an executable.

My reasoning behind this is that the test should run when packaged into an executable. And then I run each executable and test if there were no errors in stderr.

This is done for node 14, 16, 18 and 20, because I saw that these were used by github actions.

(I tested it on linux, but I'll fix the windows and macos tests as well)

[nagyszabi]

Hello there!

I managed to fix the windows and macos tests, but I seem to be having some issues with the package managers.
For example the yarn test says that it requires at least node18 to run, so I think it's not related to my changes.