Merge pull request #183 from apple/5.4-set-version-to-5.4

[5.4] Change the current SwiftPM version from 5.3.0 to 5.4.0

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())