Update unty requirement from 0.0.3 to 0.0.4 (#753)

Updates the requirements on [unty](https://github.com/bincode-org/unty) to permit the latest version.
- [Commits](bincode-org/unty@v0.0.3...v0.0.4)

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

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

Author: dependabot[bot]

Cargo.toml

@@ -34,7 +34,7 @@ derive = ["bincode_derive"]
 [dependencies]
 bincode_derive = { path = "derive", version = "2.0.0", optional = true }
 serde = { version = "1.0", default-features = false, optional = true }
-unty = "0.0.3"
+unty = "0.0.4"
 
 # Used for tests
 [dev-dependencies]