[Security] Bump acorn from 7.1.0 to 7.1.1

Bumps [acorn](https://github.com/acornjs/acorn) from 7.1.0 to 7.1.1. **This update includes a security fix.**
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](acornjs/acorn@7.1.0...7.1.1)

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

package.json

@@ -30,7 +30,7 @@
     "@vue/cli-plugin-babel": "^4.0.5",
     "@vue/cli-plugin-eslint": "^4.0.5",
     "@vue/cli-service": "^4.0.5",
-    "acorn": "^7.1.0",
+    "acorn": "^7.1.1",
     "babel-eslint": "^10.0.3",
     "compression-webpack-plugin": "^3.1.0",
     "css-loader": "^3.2.0",