Bump terser and lasso

Bumps [terser](https://github.com/terser/terser) to 5.15.0 and updates ancestor dependency [lasso](https://github.com/lasso-js/lasso). These dependencies need to be updated together.


Updates `terser` from 3.17.0 to 5.15.0
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](terser/terser@v3.17.0...v5.15.0)

Updates `lasso` from 3.4.3 to 4.0.0
- [Release notes](https://github.com/lasso-js/lasso/releases)
- [Changelog](https://github.com/lasso-js/lasso/blob/master/CHANGELOG.md)
- [Commits](lasso-js/lasso@v3.4.3...v4.0.0)

---
updated-dependencies:
- dependency-name: terser
  dependency-type: indirect
- dependency-name: lasso
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>