Bump @typescript-eslint/eslint-plugin from 5.17.0 to 5.21.0 in /frontend

Bumps [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin) from 5.17.0 to 5.21.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v5.21.0/packages/eslint-plugin)

---
updated-dependencies:
- dependency-name: "@typescript-eslint/eslint-plugin"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -38,7 +38,7 @@
     "@angular/compiler-cli": "~13.2.0",
     "@types/jasmine": "~3.10.0",
     "@types/node": "^12.11.1",
-    "@typescript-eslint/eslint-plugin": "5.17.0",
+    "@typescript-eslint/eslint-plugin": "5.21.0",
     "@typescript-eslint/parser": "5.17.0",
     "eslint": "^8.12.0",
     "jasmine-core": "~4.0.0",