chore(deps): update dependency html-validate to v6.4.0

This MR contains the following updates:

Package	Type	Update	Change
html-validate (source)	devDependencies	minor	6.3.2 -> 6.4.0

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Release Notes

html-validate/html-validate

v6.4.0

Compare Source

Features

• dom: add typeguards to attribute API (f831223)
• event: add parent element to conditional event (b248e3b)

Bug Fixes

• rules: add selector to no-conditional-comment (6391ebf), closes #​142

6.3.2 (2022-02-16)

Bug Fixes

• handle reading stdin (/dev/stdin) on Windows (dcf65d1), closes #​141
• replace \\ in urls generated on Windows (950b3cf), closes #​140

6.3.1 (2022-02-03)

Dependency upgrades

• deps: update dependency @​sidvind/better-ajv-error to v1.1.1 (8aa3438)

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