Bump eslint-utils from 1.4.3 to 2.1.0 in /swift_browser_ui_frontend

Bumps [eslint-utils](https://github.com/mysticatea/eslint-utils) from 1.4.3 to 2.1.0.
- [Release notes](https://github.com/mysticatea/eslint-utils/releases)
- [Commits](mysticatea/eslint-utils@v1.4.3...v2.1.0)

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

Author: dependabot[bot]

swift_browser_ui_frontend/package-lock.json

@@ -33,7 +33,7 @@
     "cli-highlight": "^2.1.10",
     "eslint": "^6.7.2",
     "eslint-plugin-vue": "^6.2.2",
-    "eslint-utils": "^1.4.3",
+    "eslint-utils": "^2.1.0",
     "vue-template-compiler": "^2.6.12"
   },
   "eslintConfig": {