fix: support ipv6 hosts

[oclyke]

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Proposed Changes

Propose testing for IPv6 addresses in host and using square brackets to distinguish.

The associated test fails without this fix and passes with.

Checklist

• [x] CHANGELOG.md updated
• [x] Rebased/mergeable
• [x] A test has been added if appropriate
• [x] Tests pass
• [x] Commit messages are conventional
• [x] Sign CLA (if not already signed)