chore(deps): bump ipld-dagpb from 0.2.0 to 0.2.1 in /rust

Bumps [ipld-dagpb](https://github.com/ipld/rust-ipld-dagpb) from 0.2.0 to 0.2.1.
- [Commits](ipld/rust-ipld-dagpb@v0.2.0...v0.2.1)

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

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