build(deps): update minicbor requirement from 0.19 to 0.20 (#337)

Updates the requirements on [minicbor](https://gitlab.com/twittner/minicbor) to permit the latest version.
- [Changelog](https://gitlab.com/twittner/minicbor/blob/develop/CHANGELOG.md)
- [Commits](https://gitlab.com/twittner/minicbor/compare/minicbor-v0.19.0...minicbor-v0.20.0)

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

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

pallas-codec/Cargo.toml

@@ -16,7 +16,7 @@ authors = [
 
 [dependencies]
 hex = "0.4.3"
-minicbor = { version = "0.19", features = ["std", "half", "derive"] }
+minicbor = { version = "0.20", features = ["std", "half", "derive"] }
 serde = { version = "1.0.143", features = ["derive"] }
 thiserror = "1.0.39"