Update @fortawesome/fontawesome-free-solid requirement to 5.0.9

Updates the requirements on [@fortawesome/fontawesome-free-solid](https://github.com/FortAwesome/Font-Awesome) to permit the latest version.
- [Release notes](https://github.com/FortAwesome/Font-Awesome/releases)
- [Changelog](https://github.com/FortAwesome/Font-Awesome/blob/master/CHANGELOG.md)
- [Commits](https://github.com/FortAwesome/Font-Awesome/commits/5.0.9)

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

package.json

@@ -1,7 +1,7 @@
 {
   "dependencies": {
     "@fortawesome/fontawesome": "1.1.5",
-    "@fortawesome/fontawesome-free-solid": "5.0.8",
+    "@fortawesome/fontawesome-free-solid": "5.0.9",
     "@fortawesome/fontawesome-pro-light": "5.0.9",
     "ol": "4.6.5"
   },