Bump terser from 5.14.0 to 5.16.6 in /js (#20)

Bumps [terser](https://github.com/terser/terser) from 5.14.0 to 5.16.6.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](terser/terser@v5.14.0...v5.16.6)

---
updated-dependencies:
- dependency-name: terser
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>