Bump firrtl from `f7082a4` to `899dab8` (#185)

Bumps [firrtl](https://github.com/freechipsproject/firrtl) from `f7082a4` to `899dab8`.
- [Release notes](https://github.com/freechipsproject/firrtl/releases)
- [Commits](https://github.com/freechipsproject/firrtl/compare/f7082a4aa82c384e4b45b54d7baef0c647d91ce7...899dab81b5d272758d4e4d67b2b18b4668f059a8

)

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

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