chore(deps-dev): bump @fortawesome/free-solid-svg-icons

Bumps [@fortawesome/free-solid-svg-icons](https://github.com/FortAwesome/Font-Awesome) from 5.15.4 to 6.1.1.
- [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@5.15.4...6.1.1)

---
updated-dependencies:
- dependency-name: "@fortawesome/free-solid-svg-icons"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -44,7 +44,7 @@
     "@babel/preset-env": "^7.4.4",
     "@cweili/fa-test-util": "^0.1.0",
     "@fortawesome/fontawesome-common-types": "^0.2.34",
-    "@fortawesome/free-solid-svg-icons": "^5.10.1",
+    "@fortawesome/free-solid-svg-icons": "^6.1.1",
     "@rollup/plugin-babel": "^5.2.2",
     "@rollup/plugin-node-resolve": "^13.0.0",
     "@rollup/plugin-replace": "^3.0.0",