Bump eslint from 7.18.0 to 7.24.0 in /frontend

Bumps [eslint](https://github.com/eslint/eslint) from 7.18.0 to 7.24.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v7.18.0...v7.24.0)

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

Author: dependabot-preview[bot]

frontend/package-lock.json

@@ -46,7 +46,7 @@
   },
   "devDependencies": {
     "babel-plugin-styled-components": "^1.12.0",
-    "eslint": "^7.12.1",
+    "eslint": "^7.24.0",
     "eslint-config-prettier": "^6.15.0",
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-jsx-a11y": "^6.4.1",