Group version marker modules in one directory

Author: Matejkob

Package.swift

@@ -135,17 +135,17 @@ let package = Package(
 
     .target(
       name: "SwiftSyntax509",
-      dependencies: []
+      path: "Sources/VersionMarkerModules/SwiftSyntax509"
     ),
 
     .target(
       name: "SwiftSyntax510",
-      dependencies: []
+      path: "Sources/VersionMarkerModules/SwiftSyntax510"
     ),
 
     .target(
       name: "SwiftSyntax600",
-      dependencies: []
+      path: "Sources/VersionMarkerModules/SwiftSyntax600"
     ),
 
     // MARK: SwiftSyntaxBuilder