fix: replace deprecated url.parse() with new URL()

[alumni]

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Replaces the other occurrences of url.parse() with new URL(). Continuation of PR #1802.

[titanism]

Can you fix merge conflict @alumni ?

[titanism]

released in v9.0.2

https://github.com/ladjs/superagent/releases/tag/v9.0.2

[foresterre]

This is possibly a breaking change. Previously, a value like "0.0.0.0" was accepted, while it now errors with "0.0.0.0 is not a valid URL"

[gramakri]

@alumni I think this change broke IPv6 queries. See #1805 . The change makes node resolve [x]:port as a hostname instead of IPv6 address.

[alumni]

There's a pr open to fix it ;)

[gramakri]

@alumni ah, I was hoping you would review that PR :-D (also, there was an edit in that PR saying it's hard to test)