chore: replace deprecated Node url.resolve with URL API

[tomherni]

Node's url.resolve() is deprecated.

(node:92779) [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.

It was only used to properly join URL parts (handling e.g. double slashes), which is an easy replace with the URL API.

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