build(deps-dev): Bump file-loader from 5.1.0 to 6.0.0 in /frontend (#475)

Bumps [file-loader](https://github.com/webpack-contrib/file-loader) from 5.1.0 to 6.0.0.
- [Release notes](https://github.com/webpack-contrib/file-loader/releases)
- [Changelog](https://github.com/webpack-contrib/file-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/file-loader@v5.1.0...v6.0.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

frontend/package.json

@@ -36,7 +36,7 @@
     "eslint-plugin-mozilla": "^2.1.0",
     "eslint-plugin-no-unsanitized": "^3.0.2",
     "eslint-plugin-prettier": "^3.1.0",
-    "file-loader": "^5.0.1",
+    "file-loader": "^6.0.0",
     "html-webpack-plugin": "^4.0.1",
     "mini-css-extract-plugin": "^0.9.0",
     "node-sass": "^4.12.0",