[whatwg/fetch] Block ports 4190 & 6679 (PR #1743)

Tests: https://github.com/web-platform-tests/wpt/pull/45350.

Fixes #1663.

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<a href="https://whatpr.org/fetch/1743.html" title="Last updated on Mar 26, 2024, 4:29 PM UTC (3238092)">Preview</a> | <a href="https://whatpr.org/fetch/1743/76102d5...3238092.html" title="Last updated on Mar 26, 2024, 4:29 PM UTC (3238092)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1743

-- Commit Summary --

  * Block ports 4190 & 6679

-- File Changes --

    M fetch.bs (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1743.patch
https://github.com/whatwg/fetch/pull/1743.diff

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