Bump @babel/core from 7.27.4 to 7.28.5 in /vue2/docs

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.27.4 to 7.28.5.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.28.5/packages/babel-core)

---
updated-dependencies:
- dependency-name: "@babel/core"
  dependency-version: 7.28.5
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

vue2/docs/package-lock.json

@@ -15,7 +15,7 @@
     "vue-router": "4.5.1"
   },
   "devDependencies": {
-    "@babel/core": "7.27.4",
+    "@babel/core": "7.28.5",
     "@babel/eslint-parser": "7.27.5",
     "@vue/cli-plugin-babel": "5.0.8",
     "@vue/cli-plugin-eslint": "5.0.8",