Bump chisel3 from `be4463a7` to `c8046636` (#364)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `be4463a7` to `c8046636`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/be4463a7756351dcab09ba3f576f5e3687fb0ebf...c8046636a25474be4c547c6fe9c6d742ea7b1d13

)

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

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