Bump axios from 1.9.0 to 1.12.2 in /test-apps/express-backend

Bumps [axios](https://github.com/axios/axios) from 1.9.0 to 1.12.2.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v1.x/CHANGELOG.md)
- [Commits](axios/axios@v1.9.0...v1.12.2)

---
updated-dependencies:
- dependency-name: axios
  dependency-version: 1.12.2
  dependency-type: indirect
...

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

Author: dependabot[bot]