chore(deps): bump @fortawesome/fontawesome-svg-core in /docs

Bumps [@fortawesome/fontawesome-svg-core](https://github.com/FortAwesome/Font-Awesome) from 6.4.0 to 6.4.2.
- [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/6.4.0...6.4.2)

---
updated-dependencies:
- dependency-name: "@fortawesome/fontawesome-svg-core"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

docs/package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "@docusaurus/core": "^2.4.0",
     "@docusaurus/preset-classic": "^2.4.0",
-    "@fortawesome/fontawesome-svg-core": "^6.4.0",
+    "@fortawesome/fontawesome-svg-core": "^6.4.2",
     "@fortawesome/free-solid-svg-icons": "^6.4.0",
     "@fortawesome/react-fontawesome": "^0.2.0",
     "@mdx-js/react": "^1.6.22",