chore(deps): bump serde_ipld_dagjson from 0.1.2 to 0.2.0 in /rust

Bumps [serde_ipld_dagjson](https://github.com/ipld/serde_ipld_dagjson) from 0.1.2 to 0.2.0.
- [Commits](ipld/serde_ipld_dagjson@v0.1.2...v0.2.0)

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

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