Bump nitro-testnode from 07a25f1 to 77d1447 (#297)

Bumps [nitro-testnode](https://github.com/EspressoSystems/nitro-testnode) from `07a25f1` to `77d1447`.
- [Commits](EspressoSystems/nitro-testnode@07a25f1...77d1447)

---
updated-dependencies:
- dependency-name: nitro-testnode
  dependency-type: direct:production
...

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