Bump eslint-plugin-vue from 6.2.2 to 7.7.0 in /swift_browser_ui_frontend

Bumps [eslint-plugin-vue](https://github.com/vuejs/eslint-plugin-vue) from 6.2.2 to 7.7.0.
- [Release notes](https://github.com/vuejs/eslint-plugin-vue/releases)
- [Commits](vuejs/eslint-plugin-vue@v6.2.2...v7.7.0)

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

Author: dependabot[bot]

swift_browser_ui_frontend/package-lock.json

@@ -32,7 +32,7 @@
     "babel-eslint": "^10.1.0",
     "cli-highlight": "^2.1.10",
     "eslint": "^6.7.2",
-    "eslint-plugin-vue": "^6.2.2",
+    "eslint-plugin-vue": "^7.7.0",
     "eslint-utils": "^1.4.3",
     "vue-template-compiler": "^2.6.12"
   },