Bump chisel3 from `70da39e1` to `a16a8a52` (#287)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `70da39e1` to `a16a8a52`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/70da39e140e96a9302a94864f077529e02596ef5...a16a8a52a3b2d72d80a27434217aaeba7be2d3a8

)

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

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