Bump html-validate from 9.5.3 to 9.5.5

Bumps [html-validate](https://gitlab.com/html-validate/html-validate) from 9.5.3 to 9.5.5.
- [Release notes](https://gitlab.com/html-validate/html-validate/tags)
- [Changelog](https://gitlab.com/html-validate/html-validate/blob/master/CHANGELOG.md)
- [Commits](https://gitlab.com/html-validate/html-validate/compare/v9.5.3...v9.5.5)

---
updated-dependencies:
- dependency-name: html-validate
  dependency-version: 9.5.5
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -77,7 +77,7 @@
     "govuk-prototype-kit": "^13.16.2",
     "gulp": "^5.0.0",
     "gulp-cli": "^3.0.0",
-    "html-validate": "9.5.3",
+    "html-validate": "9.5.5",
     "nunjucks": "^3.2.4",
     "outdent": "^0.8.0",
     "postcss": "^8.5.3",