Add Sendable conformance to DuplicatedIdentifierObjectType

Author: plemarquand

Sources/SWBCore/ProjectModel/Workspace.swift

@@ -14,7 +14,7 @@ import SWBProtocol
 public import SWBUtil
 public import SWBMacro
 
-public enum DuplicatedIdentifierObjectType: String {
+public enum DuplicatedIdentifierObjectType: String, Sendable {
     case project
     case target
     case reference