[5.4] Set current SwiftPM version to 5.4.0

rdar://73206582

Author: abertelrud

Sources/TSCUtility/Versioning.swift

@@ -74,7 +74,7 @@ public struct Versioning {
 
     /// The current version of the package manager.
     public static let currentVersion = SwiftVersion(
-        version: (5, 3, 0),
+        version: (5, 4, 0),
         isDevelopment: true,
         buildIdentifier: getBuildIdentifier())