[whatwg/url] Add U+005E (^) to the path percent-encode set (PR #846)

Closes #607.

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I'm not going to merge this until February 2025 due to Interop 2024, but I wanted to put this out there for review.

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### :boom: Error: options.uri is a required argument :boom: ###

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

  https://github.com/whatwg/url/pull/846

-- Commit Summary --

  * Add U+005E (^) to the path percent-encode set

-- File Changes --

    M url.bs (4)

-- Patch Links --

https://github.com/whatwg/url/pull/846.patch
https://github.com/whatwg/url/pull/846.diff

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