[whatwg/xhr] Meta: update repository files (#273)

See https://github.com/whatwg/spec-factory for details.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/273

-- Commit Summary --

  * Meta: update repository files

-- File Changes --

    M .pr-preview.json (12)

-- Patch Links --

https://github.com/whatwg/xhr/pull/273.patch
https://github.com/whatwg/xhr/pull/273.diff

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