chore(deps)(deps-dev): Bump @angular-eslint/eslint-plugin from 20.6.0 to 21.0.1 in /frontend (#97)

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -55,7 +55,7 @@
   },
   "devDependencies": {
     "@angular-eslint/builder": "^20.6.0",
-    "@angular-eslint/eslint-plugin": "^20.6.0",
+    "@angular-eslint/eslint-plugin": "^21.0.1",
     "@angular-eslint/eslint-plugin-template": "^20.6.0",
     "@angular-eslint/template-parser": "^20.6.0",
     "@angular/build": "^20.3.10",