build(deps-dev): bump eslint-config-standard in /frontend

Bumps [eslint-config-standard](https://github.com/standard/eslint-config-standard) from 14.1.1 to 15.0.0.
- [Release notes](https://github.com/standard/eslint-config-standard/releases)
- [Changelog](https://github.com/standard/eslint-config-standard/blob/master/CHANGELOG.md)
- [Commits](standard/eslint-config-standard@v14.1.1...v15.0.0)

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

Author: dependabot[bot]

frontend/package.json

@@ -29,7 +29,7 @@
     "css-loader": "^5.0.0",
     "eslint": "^7.5.0",
     "eslint-config-prettier": "^6.2.0",
-    "eslint-config-standard": "^14.1.0",
+    "eslint-config-standard": "^15.0.0",
     "eslint-loader": "^4.0.0",
     "eslint-plugin-fetch-options": "0.0.5",
     "eslint-plugin-html": "^6.0.0",