Bump @babel/helpers in /2-WebApp-graph-user/2-6-BFF-Proxy/ClientApp

Bumps [@babel/helpers](https://github.com/babel/babel/tree/HEAD/packages/babel-helpers) from 7.18.2 to 7.28.2.
- [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/v7.28.2/packages/babel-helpers)

---
updated-dependencies:
- dependency-name: "@babel/helpers"
  dependency-version: 7.28.2
  dependency-type: indirect
...

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

Author: dependabot[bot]