fix(socks-proxy-agent): trim brackets from IPv6 literal proxy hosts

[rajanpanth]

Fixes #437.

WHATWG URL keeps the brackets in hostname for IPv6 literals (new URL('socks://[::1]:1080').hostname === '[::1]'), and parseSocksURL passed that straight through as the proxy host, so the socks connection tried to resolve [::1] as a name and failed with getaddrinfo ENOTFOUND [::1].

The fix mirrors the trim this monorepo already does in https-proxy-agent (same regex, same comment), so the two agents now treat IPv6 proxy URLs the same way:

// Trim off the brackets from IPv6 addresses
const host = url.hostname.replace(/^\[|\]$/g, '');

Non-bracketed hosts are untouched (127.0.0.1, hostnames), and a changeset is not included since I do not know the release cadence you want; happy to add one.

Test added asserting socks5h://[::1]:1080 produces proxy.host === '::1'. 13 passing; with the source change reverted, the new test fails.

[changeset-bot]

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Latest commit: aec7eb2

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