Bump chisel3 from `1e9f4e99` to `9b8536b6` (#354)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `1e9f4e99` to `9b8536b6`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/1e9f4e99167d1bc132a1a1a04e6987c2161c4d0e...9b8536b6af9f029a0edfb1c8df4f47a67e861c9d

)

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

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