Bump chisel3 from `d766e8f7` to `efd47484` (#283)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `d766e8f7` to `efd47484`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/d766e8f7270579406d54abc9015d494cd199c6ce...efd474842738444a030fbe7702d58d4a249d6ebc

)

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

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