Bump chisel3 from `db0fe3fb` to `91ad2312` (#253)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `db0fe3fb` to `91ad2312`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/db0fe3fb23c3f50be0aeb859b19cb96967e15186...91ad2312cab72442fcfec9c28576b5464669f8fd

)

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

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