fix: url.parse deprecation warning

[kapouer]

Checklist

• npm install && npm run lint && npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

url.parse is deprecated ! Let's replace it by new URL(str).pathname (ignoring search), because these are file paths.

[cclauss]

I am still seeing this warning in our GitHub Actions tests:

> node-gyp@12.1.0 test
> cross-env NODE_GYP_NULL_LOGGER=true mocha --timeout 30000 test/test-download.js test/test-*
  download
    ✔ download over http
    ✔ download over https with custom ca
    ✔ download over http with proxy
    ✔ download over http with noproxy
    ✔ download with missing cafile
    ✔ check certificate splitting
(node:2575) [DEP0169] DeprecationWarning: `url.parse()` behavior is not standardized and prone to errors
  that have security implications. Use the WHATWG URL API instead. CVEs are not issued for `url.parse()`
  vulnerabilities.
(Use `node --trace-deprecation ...` to show where the warning was created)
    ✔ download headers (actual) (8652ms)

[kapouer]

@cclauss indeed, I didn't fix the url.resolve calls. I'll do a PR later today.