Bump chisel3 from `e3f3c5e7` to `e8febc76` (#209)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `e3f3c5e7` to `e8febc76`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/e3f3c5e7c5b2bd0f4d4d5d6470908fa0dc78fc74...e8febc767354ffdbbee9eadcf164e6ad75d4c8df

)

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

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