Adopt SwiftPM ModulesGraph initializer API adjustment

`ModulesGraph.init` was changed by swiftlang/swift-package-manager#7530
to accept `packages` as a way to avoid having to recompute the full
list of packages by walking roots.

(cherry picked from commit 2270631)
(cherry picked from commit b13244f)

Sources/SKSwiftPMWorkspace/SwiftPMBuildSystem.swift

@@ -211,6 +211,7 @@ public actor SwiftPMBuildSystem {
 
     self.modulesGraph = try ModulesGraph(
       rootPackages: [],
+      packages: IdentifiableSet(),
       dependencies: [],
       binaryArtifacts: [:]
     )