Bump file-loader from 4.0.0 to 4.2.0 in /app (#213)

Bumps [file-loader](https://github.com/webpack-contrib/file-loader) from 4.0.0 to 4.2.0.
- [Release notes](https://github.com/webpack-contrib/file-loader/releases)
- [Changelog](https://github.com/webpack-contrib/file-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/file-loader/compare/v4.0.0...v4.2.0)

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

app/package.json

@@ -25,7 +25,7 @@
     "diff": "^4.0.1",
     "dot-prop": "^5.0.0",
     "electron-telemetry": "git+https://github.com/thomasnordquist/electron-telemetry.git#dist",
-    "file-loader": "^4.0.0",
+    "file-loader": "^4.2.0",
     "get-value": "^3.0.1",
     "immutable": "^4.0.0-rc.12",
     "in-viewport": "^3.6.0",