chore(deps): update cast requirement from 0.2.3 to 0.3.0 (#9)

Updates the requirements on [cast](https://github.com/japaric/cast.rs) to permit the latest version.
- [Release notes](https://github.com/japaric/cast.rs/releases)
- [Changelog](https://github.com/japaric/cast.rs/blob/main/CHANGELOG.md)
- [Commits](japaric/cast.rs@v0.2.3...v0.3.0)

---
updated-dependencies:
- dependency-name: cast
  dependency-type: direct:production
...

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

Cargo.toml

@@ -18,5 +18,5 @@ nb = "1.0.0"
 
 [dependencies.cast]
 default-features = false
-version = "0.2.3"
+version = "0.3.0"
 uninit = "0.1.0"