Bump firrtl from `270c913` to `97dbe29` (#167)

Bumps [firrtl](https://github.com/freechipsproject/firrtl) from `270c913` to `97dbe29`.
- [Release notes](https://github.com/freechipsproject/firrtl/releases)
- [Commits](https://github.com/freechipsproject/firrtl/compare/270c91380d8d7c0c2fe3583b65450500d49845b6...97dbe29eae140a4ef0e241681f128ba8a7633b2e

)

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

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