Bump terser from 5.14.0 to 5.15.1 in /testbed2d

Bumps [terser](https://github.com/terser/terser) from 5.14.0 to 5.15.1.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](terser/terser@v5.14.0...v5.15.1)

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

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

Author: dependabot[bot]