Bump nitro-testnode from 77d1447 to 100d2b3 (#381)

Bumps [nitro-testnode](https://github.com/EspressoSystems/nitro-testnode) from `77d1447` to `100d2b3`.
- [Commits](EspressoSystems/nitro-testnode@77d1447...100d2b3)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>