build(deps-dev): bump rollup from 4.39.0 to 4.40.0 in /clients/js-legacy (#217)

Bumps [rollup](https://github.com/rollup/rollup) from 4.39.0 to 4.40.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v4.39.0...v4.40.0)

---
updated-dependencies:
- dependency-name: rollup
  dependency-version: 4.40.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]