fix: update dependencies and fix error type reference

- Update swift-rfc-1123 to 0.3.1
- Fix RFC_1123.Domain.ValidationError to RFC_1123.Domain.Error

Author: coenttb

Package.swift

@@ -15,7 +15,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/swift-standards/swift-incits-4-1986.git", from: "0.1.0"),
-        .package(url: "https://github.com/swift-standards/swift-rfc-1123.git", from: "0.0.1")
+        .package(url: "https://github.com/swift-standards/swift-rfc-1123.git", from: "0.3.1")
     ],
     targets: [
         .target(

Tests/RFC 5321 Tests/RFC 5321 Tests.swift

@@ -20,7 +20,7 @@ struct `RFC 5321 Domain Tests` {
 
     @Test
     func `Fails with empty address literal`() throws {
-        #expect(throws: Domain.ValidationError.self) {
+        #expect(throws: RFC_1123.Domain.Error.self) {
             _ = try RFC_1123.Domain("[]")
         }
     }