build(deps): bump @fortawesome/free-brands-svg-icons (#281)

Bumps [@fortawesome/free-brands-svg-icons](https://github.com/FortAwesome/Font-Awesome) from 5.15.3 to 6.4.0.
- [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@5.15.3...6.4.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -7,7 +7,7 @@
   "dependencies": {
     "@browniebroke/gatsby-image-gallery": "3.5.2",
     "@fortawesome/fontawesome-svg-core": "6.4.0",
-    "@fortawesome/free-brands-svg-icons": "5.15.3",
+    "@fortawesome/free-brands-svg-icons": "6.4.0",
     "@fortawesome/free-regular-svg-icons": "6.4.0",
     "@fortawesome/free-solid-svg-icons": "5.15.3",
     "@fortawesome/react-fontawesome": "0.1.17",