*OS 26 Compatibility aka Backport standardized URL from swift-foundation

[swhitty]

Foundation on the *OS 26 releases now includes the same Swift URL implementation used by Linux etc swiftlang/swift-foundation#1238.

This includes some bug fixes for invalid URL conversions which then provides awkward forks in FlyingFox parsing of URL across OS versions. This PR back ports the standardized path logic (removingDotSegments) form swift-foundation so FlyingFox has consistent behaviour across platforms and OS versions.

[codecov]

Codecov Report

❌ Patch coverage is 76.61290% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.61%. Comparing base (6f06029) to head (19971ed).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...lyingFox/Sources/HTTPDecoder+StandardizePath.swift	76.42%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
- Coverage   94.10%   93.61%   -0.49%     
==========================================
  Files          62       63       +1     
  Lines        4138     4261     +123     
==========================================
+ Hits         3894     3989      +95     
- Misses        244      272      +28     

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