Bump @fortawesome/free-solid-svg-icons from 6.4.0 to 6.4.2 in /client

Bumps [@fortawesome/free-solid-svg-icons](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/free-solid-svg-icons"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

client/package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@fortawesome/fontawesome-svg-core": "^6.4.2",
-    "@fortawesome/free-solid-svg-icons": "^6.4.0",
+    "@fortawesome/free-solid-svg-icons": "^6.4.2",
     "@fortawesome/react-fontawesome": "^0.2.0",
     "buffer": "^6.0.3",
     "qrcode.react": "^3.1.0",