chore(deps): Update bs58 requirement in ucan-key-support (#103)

Updates the requirements on [bs58](https://github.com/Nullus157/bs58-rs) to permit the latest version.
- [Changelog](https://github.com/Nullus157/bs58-rs/blob/main/CHANGELOG.md)
- [Commits](Nullus157/bs58-rs@0.4.0...0.5.0)

---
updated-dependencies:
- dependency-name: bs58
  dependency-type: direct:production
...

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ucan-key-support/Cargo.toml

@@ -22,7 +22,7 @@ default = []
 [dependencies]
 anyhow = "1.0"
 async-trait = "0.1"
-bs58 = "0.4"
+bs58 = "0.5"
 ed25519-zebra = "3.1"
 log = "0.4"
 rsa = "0.8"