Bump esbuild from 0.25.0 to 0.28.1 in /test-setup

Bumps [esbuild](https://github.com/evanw/esbuild) from 0.25.0 to 0.28.1.
- [Release notes](https://github.com/evanw/esbuild/releases)
- [Changelog](https://github.com/evanw/esbuild/blob/main/CHANGELOG-2025.md)
- [Commits](evanw/esbuild@v0.25.0...v0.28.1)

---
updated-dependencies:
- dependency-name: esbuild
  dependency-version: 0.28.1
  dependency-type: direct:development
...

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Author: dependabot[bot]