Bump chisel3 from `9b54b648` to `61fbf23c` (#156)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `9b54b648` to `61fbf23c`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/9b54b6481ad13c3c8b59b816db7c5d955bf0a15f...61fbf23c75cf1190735a881ebc0727da6615ecf6

)

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