[whatwg/fetch] Update :protocol to webtransport-h3 for WebTransport over HTTP/3 (PR #1930)

[WebTransport over HTTP/3 draft-15](https://datatracker.ietf.org/doc/html/draft-ietf-webtrans-http3-15#name-creating-a-new-session:~:text=be%20set%20to-,webtransport%2Dh3,-.) renamed the extended-CONNECT `:protocol` pseudo-header value from `webtransport` to `webtransport-h3`. [WebTransport over HTTP/2](https://datatracker.ietf.org/doc/html/draft-ietf-webtrans-http2-14#name-creating-a-new-session:~:text=to-,webtransport) keeps `webtransport`, making it depend on _connection_.

- [ ] At least two implementers are interested (and none opposed):
   * Firefox: implementing draft-15 in [bug 2033974](https://bugzil.la/2033974)
   * Chromium: …
   * WebKit: …
- [ ] Tested with web-platform-tests: WebTransport WPT exercises the H3 handshake; the draft-15 `:protocol` value is covered by the server update in [bug 2033974](https://bugzil.la/2033974).
- [ ] MDN issue / update: N/A (not author-observable).
- [x] The top of this comment includes a clear commit message.
- [ ] At least two implementers are interested (and none opposed):
   * …
   * …


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  https://github.com/whatwg/fetch/pull/1930

-- Commit Summary --

  * Set :protocol to webtransport-h3 for WebTransport over HTTP/3

-- File Changes --

    M fetch.bs (7)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1930.patch
https://github.com/whatwg/fetch/pull/1930.diff

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