chore(deps): update dependency html-validate to v8.4.0

This MR contains the following updates:

Package	Type	Update	Change
html-validate (source)	devDependencies	minor	8.3.0 -> 8.4.0

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Release Notes

html-validate/html-validate (html-validate)

v8.4.0

Compare Source

Features

• html5: support <search> element (720bdd9)
• new implicitRole metadata for better handling of implicit ARIA roles (fe45ec4), closes #​224

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