chore(deps): update dependency html-validate to v5.5.0

This MR contains the following updates:

Package	Type	Update	Change
html-validate (source)	devDependencies	minor	5.4.0 -> 5.5.0

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Release Notes

html-validate/html-validate

v5.5.0

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Features

• dom: add iterator to DOMTokenList (7bef736)
• rules: no-missing-references handles more aria attributes (2843680)
• rules: add minInitialRank option to heading-level (7f58572), closes #​132

Bug Fixes

• jest: synchronous matchers as long as the passed value is synchronous (0ede9f7)
• rules: no-missing-references handles attributes with reference lists (2afcd86), closes #​133

5.4.1 (2021-08-29)

Bug Fixes

• meta: use global meta as base when merging (9fe3793), closes #​60

v5.4.1

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