build(deps): update utxorpc-spec requirement from 0.3.0 to 0.4.4 (#425)

Updates the requirements on [utxorpc-spec](https://github.com/utxorpc/spec) to permit the latest version.
- [Commits](utxorpc/spec@v0.3.0...v0.4.4)

---
updated-dependencies:
- dependency-name: utxorpc-spec
  dependency-type: direct:production
...

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pallas-utxorpc/Cargo.toml

@@ -11,7 +11,7 @@ readme = "README.md"
 authors = ["Santiago Carmuega <santiago@carmuega.me>"]
 
 [dependencies]
-utxorpc-spec = { version = "0.3.0" }
+utxorpc-spec = { version = "0.4.4" }
 pallas-traverse = { version = "=0.24.0", path = "../pallas-traverse" }
 pallas-primitives = { version = "=0.24.0", path = "../pallas-primitives" }
 pallas-codec = { version = "=0.24.0", path = "../pallas-codec" }