build(deps): bump the production-dependencies group with 1 update

Bumps the production-dependencies group with 1 update: [@fortawesome/fontawesome-free](https://github.com/FortAwesome/Font-Awesome).

- [Release notes](https://github.com/FortAwesome/Font-Awesome/releases)
- [Changelog](https://github.com/FortAwesome/Font-Awesome/blob/6.x/CHANGELOG.md)
- [Commits](FortAwesome/Font-Awesome@5.15.4...6.4.2)

---
updated-dependencies:
- dependency-name: "@fortawesome/fontawesome-free"
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: production-dependencies
...

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

package.json

@@ -50,7 +50,7 @@
   },
   "dependencies": {
     "@fancyapps/fancybox": "3.5.7",
-    "@fortawesome/fontawesome-free": "5.15.4",
+    "@fortawesome/fontawesome-free": "6.4.2",
     "algoliasearch": "4.20.0",
     "gitalk": "1.8.0",
     "gitment": "0.0.3",