chore(deps): bump terser from 4.4.3 to 4.6.9

Bumps [terser](https://github.com/terser/terser) from 4.4.3 to 4.6.9.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](terser/terser@v4.4.3...v4.6.9)

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