Bump @fortawesome/fontawesome-free from 5.14.0 to 5.15.1 in /app

Bumps [@fortawesome/fontawesome-free](https://github.com/FortAwesome/Font-Awesome) from 5.14.0 to 5.15.1.
- [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/compare/5.14.0...5.15.1)

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

app/package.json

@@ -59,7 +59,7 @@
     ],
     "license": "GPL-3.0",
     "dependencies": {
-        "@fortawesome/fontawesome-free": "^5.14.0",
+        "@fortawesome/fontawesome-free": "^5.15.1",
         "electron-dl": "^3.0.2",
         "jimp": "^0.16.1",
         "jquery": "^3.5.1",

app/yarn.lock

@@ -74,10 +74,10 @@
     minimatch "^3.0.4"
     strip-json-comments "^3.1.1"
 
-"@fortawesome/fontawesome-free@^5.14.0":
-  version "5.14.0"
-  resolved "https://registry.yarnpkg.com/@fortawesome/fontawesome-free/-/fontawesome-free-5.14.0.tgz#a371e91029ebf265015e64f81bfbf7d228c9681f"
-  integrity sha512-OfdMsF+ZQgdKHP9jUbmDcRrP0eX90XXrsXIdyjLbkmSBzmMXPABB8eobUJtivaupucYaByz6WNe1PI1JuYm3qA==
+"@fortawesome/fontawesome-free@^5.15.1":
+  version "5.15.1"
+  resolved "https://registry.yarnpkg.com/@fortawesome/fontawesome-free/-/fontawesome-free-5.15.1.tgz#ccfef6ddbe59f8fe8f694783e1d3eb88902dc5eb"
+  integrity sha512-OEdH7SyC1suTdhBGW91/zBfR6qaIhThbcN8PUXtXilY4GYnSBbVqOntdHbC1vXwsDnX0Qix2m2+DSU1J51ybOQ==
 
 "@jimp/bmp@^0.16.1":
   version "0.16.1"