Bump @fortawesome/free-solid-svg-icons from 6.2.0 to 6.4.2

Bumps [@fortawesome/free-solid-svg-icons](https://github.com/FortAwesome/Font-Awesome) from 6.2.0 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](FortAwesome/Font-Awesome@6.2.0...6.4.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -11,7 +11,7 @@
     "@emotion/styled": "^11.9.3",
     "@fortawesome/fontawesome-svg-core": "^6.1.1",
     "@fortawesome/free-brands-svg-icons": "^5.7.2",
-    "@fortawesome/free-solid-svg-icons": "^6.2.0",
+    "@fortawesome/free-solid-svg-icons": "^6.4.2",
     "@fortawesome/react-fontawesome": "^0.2.0",
     "@gatsby-contrib/gatsby-plugin-elasticlunr-search": "^3.0.2",
     "@material-ui/core": "^3.9.2",