chore(deps): bump multihash from 0.19.1 to 0.19.3

Bumps [multihash](https://github.com/multiformats/rust-multihash) from 0.19.1 to 0.19.3.
- [Changelog](https://github.com/multiformats/rust-multihash/blob/master/CHANGELOG.md)
- [Commits](multiformats/rust-multihash@v0.19.1...v0.19.3)

---
updated-dependencies:
- dependency-name: multihash
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]