Bump terser from 4.3.1 to 4.3.4
Bump terser from 4.3.1 to 4.3.4

Bumps [terser](https://github.com/terser/terser) from 4.3.1 to 4.3.4.
- [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/v4.3.1...v4.3.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
vega/vega-loader-arrow