Bump aleph-bft from 0.13.0 to 0.20.1

Bumps [aleph-bft](https://github.com/Cardinal-Cryptography/AlephBFT) from 0.13.0 to 0.20.1.
- [Release notes](https://github.com/Cardinal-Cryptography/AlephBFT/releases)
- [Commits](https://github.com/Cardinal-Cryptography/AlephBFT/commits)

---
updated-dependencies:
- dependency-name: aleph-bft
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>