Bumps [terser](https://github.com/terser/terser) from 5.3.7 to 5.3.8.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/compare/v5.3.7...v5.3.8)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>