Bump firrtl from `899dab8` to `fe5a56e` (#187)

Bumps [firrtl](https://github.com/freechipsproject/firrtl) from `899dab8` to `fe5a56e`.
- [Release notes](https://github.com/freechipsproject/firrtl/releases)
- [Commits](https://github.com/freechipsproject/firrtl/compare/899dab81b5d272758d4e4d67b2b18b4668f059a8...fe5a56e80d96d306e1bdab8dd05fc1567214907b

)

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

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