Bump chisel3 from `945416c6` to `db18ae16` (#325)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `945416c6` to `db18ae16`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/945416c628656498be7a98dcd4899f2b9e830c00...db18ae16a26dab5231ca83172c88b9735a977582

)

---
updated-dependencies:
- dependency-name: chisel3
  dependency-type: direct:production
...

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