Bump terser from 5.3.8 to 5.4.0 (#34)

Bumps [terser](https://github.com/terser/terser) from 5.3.8 to 5.4.0.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](terser/terser@v5.3.8...v5.4.0)

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