Bump chisel3 from `42f5d890` to `a689c7c0` (#302)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `42f5d890` to `a689c7c0`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/42f5d89045e7db323670964a982c59319cf9001f...a689c7c0dd336fe0b9db6171786993b190a700f8

)

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

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