build(deps-dev): bump eslint from 7.26.0 to 7.31.0 in /frontend (#1025)

Bumps [eslint](https://github.com/eslint/eslint) from 7.26.0 to 7.31.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v7.26.0...v7.31.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

frontend/package-lock.json

@@ -28,7 +28,7 @@
     "clean-webpack-plugin": "^3.0.0",
     "css-loader": "^6.2.0",
     "css-minimizer-webpack-plugin": "^2.0.0",
-    "eslint": "^7.26.0",
+    "eslint": "^7.31.0",
     "eslint-config-prettier": "^6.2.0",
     "eslint-config-standard": "^16.0.1",
     "eslint-loader": "^4.0.0",