Bump firrtl from 01e567d to e97c7b1 (#385)

Bumps [firrtl](https://github.com/freechipsproject/firrtl) from `01e567d` to `e97c7b1`.
- [Release notes](https://github.com/freechipsproject/firrtl/releases)
- [Commits](chipsalliance/firrtl@01e567d...e97c7b1)

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

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