chore(deps): update dependency html-validate to v8.7.0

This MR contains the following updates:

Package	Type	Update	Change
html-validate (source)	devDependencies	minor	8.6.0 -> 8.7.0

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Release Notes

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

v8.7.0

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Features

• html5: support referrerpolicy attribute (851b559)

v8.6.1

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Bug Fixes

• dom: remove usage of regex negative lookbehind (f406393), closes #​147
• rules: improve attribute-misuse error message (fccce69), closes #​226
• typo in CONTRIBUTING.md (855bacf)

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