Bump @fortawesome/free-solid-svg-icons from 5.15.3 to 5.15.4 (#544)

Bumps [@fortawesome/free-solid-svg-icons](https://github.com/FortAwesome/Font-Awesome) from 5.15.3 to 5.15.4.
- [Release notes](https://github.com/FortAwesome/Font-Awesome/releases)
- [Changelog](https://github.com/FortAwesome/Font-Awesome/blob/master/CHANGELOG.md)
- [Commits](FortAwesome/Font-Awesome@5.15.3...5.15.4)

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

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

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

package.json

@@ -47,7 +47,7 @@
     "@fortawesome/fontawesome-svg-core": "1.2.35",
     "@fortawesome/free-brands-svg-icons": "5.15.3",
     "@fortawesome/free-regular-svg-icons": "5.15.3",
-    "@fortawesome/free-solid-svg-icons": "5.15.3",
+    "@fortawesome/free-solid-svg-icons": "5.15.4",
     "@ggrossetie/pagedjs": "0.1.43-next.1613141153",
     "chokidar": "3.5.2",
     "file-url": "3.0.0",