[whatwg/fetch] Block port 10080 (#1214)

Tests: https://github.com/web-platform-tests/wpt/pull/28445.

Fixes #1191.

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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1214

-- Commit Summary --

  * Block port 10080

-- File Changes --

    M fetch.bs (1)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1214.patch
https://github.com/whatwg/fetch/pull/1214.diff

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