Bump chisel3 from `0ff14a94` to `b8f884e1` (#319)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `0ff14a94` to `b8f884e1`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/0ff14a949f6781f5d76c6088202863d16cb24a18...b8f884e15114b7c9f29b1ec8f23a4216bcbfca76

)

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

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