Bump @fortawesome/fontawesome-free from 6.6.0 to 6.7.1

Bumps [@fortawesome/fontawesome-free](https://github.com/FortAwesome/Font-Awesome) from 6.6.0 to 6.7.1.
- [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@6.6.0...6.7.1)

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

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

package.json

@@ -6,7 +6,7 @@
     "doc": "doc"
   },
   "dependencies": {
-    "@fortawesome/fontawesome-free": "6.6.0"
+    "@fortawesome/fontawesome-free": "6.7.1"
   },
   "devDependencies": {
     "remark-cli": "12.0.1",