Bump @fortawesome/fontawesome-free from 5.15.4 to 6.1.2

Bumps [@fortawesome/fontawesome-free](https://github.com/FortAwesome/Font-Awesome) from 5.15.4 to 6.1.2.
- [Release notes](https://github.com/FortAwesome/Font-Awesome/releases)
- [Changelog](https://github.com/FortAwesome/Font-Awesome/blob/6.x/CHANGELOG.md)
- [Commits](https://github.com/FortAwesome/Font-Awesome/compare/5.15.4...6.1.2)

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

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

package.json

@@ -1,6 +1,6 @@
 {
   "dependencies": {
-    "@fortawesome/fontawesome-free": "^5.15.4",
+    "@fortawesome/fontawesome-free": "^6.1.2",
     "@rails/webpacker": "^5.4.3",
     "@sentry/browser": "^6.11.0",
     "bootstrap": "^4.6.2",