build(deps-dev): Bump html-validate from 8.6.0 to 8.7.0

Bumps [html-validate](https://gitlab.com/html-validate/html-validate) from 8.6.0 to 8.7.0.
- [Release notes](https://gitlab.com/html-validate/html-validate/tags)
- [Commits](https://gitlab.com/html-validate/html-validate/compare/v8.6.0...v8.7.0)

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

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

package.json

@@ -40,7 +40,7 @@
     "grunt-contrib-uglify": "^5.2.2",
     "grunt-contrib-watch": "^1.1.0",
     "grunt-eslint": "^24.3.0",
-    "html-validate": "^8.6.0",
+    "html-validate": "^8.7.0",
     "https-proxy-agent": "^7.0.2",
     "isbinaryfile": "^5.0.0"
   }