[whatwg/url] Make port state override return failure more for URLPattern (PR #866)

In particular for inputs that do not start with an ASCII digit.

Tests: https://github.com/web-platform-tests/wpt/pull/51505.

This fixes https://github.com/whatwg/urlpattern/issues/266.

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<a href="https://whatpr.org/url/866.html" title="Last updated on Mar 20, 2025, 9:45 PM UTC (cdd32a1)">Preview</a> | <a href="https://whatpr.org/url/866/c23aec1...cdd32a1.html" title="Last updated on Mar 20, 2025, 9:45 PM UTC (cdd32a1)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/866

-- Commit Summary --

  * Make port state override return failure more for URLPattern

-- File Changes --

    M url.bs (16)

-- Patch Links --

https://github.com/whatwg/url/pull/866.patch
https://github.com/whatwg/url/pull/866.diff

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