PostHTML URLs v2.0.0

Thank you @tmcw for the assistance on this one!

Breaking

• Node minimum bumped from 18+ to 22.12+
• Removes support for h descriptors which were proposed but ultimately unsupported sindresorhus/srcset#6 (via #6)

Changes

• Dependency count decreased from 5 to 3
• Disk cost decreased from 244KB to 72KB!
• Switches from parse-srcset to srcset by @tmcw in #6
• Dev: Switch to vitest, remove unnecessary deps by @tmcw in #4

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Milestone: https://github.com/11ty/eleventy-posthtml-urls/milestone/2?closed=1
Full Changelog: v1.0.3...v2.0.0