Bump chisel3 from `23ef9aa7` to `16dfc84d` (#331)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `23ef9aa7` to `16dfc84d`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/23ef9aa7ffef5bbf8fe124fc9be7683f005c3612...16dfc84d6667f1f6bbca46935cb445bc288c96d4

)

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

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