Bump firrtl from `559c667` to `f7082a4` (#183)

Bumps [firrtl](https://github.com/freechipsproject/firrtl) from `559c667` to `f7082a4`.
- [Release notes](https://github.com/freechipsproject/firrtl/releases)
- [Commits](https://github.com/freechipsproject/firrtl/compare/559c66722a858092e92c1b293331b343fc180c03...f7082a4aa82c384e4b45b54d7baef0c647d91ce7

)

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

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