build(deps-dev): bump eslint from 7.21.0 to 7.22.0 in /frontend

Bumps [eslint](https://github.com/eslint/eslint) from 7.21.0 to 7.22.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v7.21.0...v7.22.0)

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -28,7 +28,7 @@
     "clean-webpack-plugin": "^3.0.0",
     "css-loader": "^5.1.1",
     "css-minimizer-webpack-plugin": "^1.2.0",
-    "eslint": "^7.21.0",
+    "eslint": "^7.22.0",
     "eslint-config-prettier": "^6.2.0",
     "eslint-config-standard": "^16.0.1",
     "eslint-loader": "^4.0.0",