[whatwg/url] Editorial: remove support for files in the urlencoded serialization (#585)

After whatwg/html#6287, no callers are left which invoke the `application/x-www-form-urlencoded` serializer with file values.

Do not merge before whatwg/html#6287.

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

  https://github.com/whatwg/url/pull/585

-- Commit Summary --

  * Editorial: remove support for files in the urlencoded serialization

-- File Changes --

    M url.bs (12)

-- Patch Links --

https://github.com/whatwg/url/pull/585.patch
https://github.com/whatwg/url/pull/585.diff

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