feat(yargs): update yargs to 18.0.0

New yargs version bundling is failing, because it is newly ESM-only module:

 * It is not included in `esbuild` and `pkg` does not patch [ESM import
   paths][1].
 * If added into `esbuild`, the transpiled `import.meta.url` is empty and
   execution fails.

Fix this by letting `esbuild` transpile also `yargs` to CJS, but provide a
sensible value for `import.meta.url` as mentioned in the esbuild [bug
report][2].

While at it, also update `@yao-pkg/pkg` to support newer Node.js runtime.

[1]: yao-pkg/pkg#16 (comment)
[2]: evanw/esbuild#2441 (comment)

Signed-off-by: Oldřich Jedlička <oldium.pro@gmail.com>

Author: oldium