Merge pull request #2095 from bripeticca/swiftpmapi/fiximport

Update import on SwiftPM PackageModel for `SwiftPMBuildSystem.swift`

Author: ahoppen

Sources/BuildSystemIntegration/SwiftPMBuildSystem.swift

@@ -20,7 +20,7 @@ package import LanguageServerProtocol
 import LanguageServerProtocolExtensions
 @preconcurrency import PackageGraph
 import PackageLoading
-import PackageModel
+@preconcurrency import PackageModel
 import SKLogging
 package import SKOptions
 @preconcurrency package import SPMBuildCore