Bump lalrpop-util from 0.19.3 to 0.19.4

Bumps [lalrpop-util](https://github.com/lalrpop/lalrpop) from 0.19.3 to 0.19.4.
- [Release notes](https://github.com/lalrpop/lalrpop/releases)
- [Changelog](https://github.com/lalrpop/lalrpop/blob/master/RELEASES.md)
- [Commits](lalrpop/lalrpop@0.19.3...0.19.4)

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