Bump @babel/core from 7.27.4 to 7.28.0 in /js

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.27.4 to 7.28.0.
- [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/v7.28.0/packages/babel-core)

---
updated-dependencies:
- dependency-name: "@babel/core"
  dependency-version: 7.28.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

js/package.json

@@ -50,7 +50,7 @@
   },
   "devDependencies": {
     "@babel/cli": "^7.27.2",
-    "@babel/core": "^7.27.1",
+    "@babel/core": "^7.28.0",
     "@babel/eslint-parser": "^7.28.0",
     "@babel/preset-env": "^7.27.2",
     "@jupyterlab/builder": "^4.4.5",