Bump terser from 4.6.7 to 4.6.9 (#30483)

Bump terser from 4.6.7 to 4.6.9 (#30483)

Bumps [terser](https://github.com/terser/terser) from 4.6.7 to 4.6.9.
- [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/v4.6.7...v4.6.9)

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