Bump pm2 from 4.5.6 to 5.4.2 in /api-expressjs-vm

Bumps [pm2](https://github.com/Unitech/pm2) from 4.5.6 to 5.4.2.
- [Release notes](https://github.com/Unitech/pm2/releases)
- [Changelog](https://github.com/Unitech/pm2/blob/master/CHANGELOG.md)
- [Commits](Unitech/pm2@4.5.6...v5.4.2)

---
updated-dependencies:
- dependency-name: pm2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]