Fix for builds broken by Xcode 16

lib/xcodeproj/constants.rb

@@ -132,6 +132,7 @@ module Constants
     # @return [Hash] The compatibility version string for different object versions.
     #
     COMPATIBILITY_VERSION_BY_OBJECT_VERSION = {
+      70 => 'Xcode 16.0',
       63 => 'Xcode 15.3',
       60 => 'Xcode 15.0',
       56 => 'Xcode 14.0',

lib/xcodeproj/project/object/group.rb

@@ -501,6 +501,11 @@ class XCVersionGroup < PBXGroup
       end
 
       #-----------------------------------------------------------------------#
+
+      # A new group type introduced by Xcode 16
+      #
+      class PBXFileSystemSynchronizedRootGroup < PBXGroup
+      end
     end
   end
 end

lib/xcodeproj/project/object/native_target.rb

@@ -461,6 +461,11 @@ class PBXNativeTarget < AbstractTarget
         #
         has_many :build_phases, AbstractBuildPhase
 
+        # @return [ObjectList<PBXFileSystemSynchronizedRootGroup>] the synchronized 
+        #         folder groups used by this target.
+        #
+        has_many :fileSystemSynchronizedGroups, PBXFileSystemSynchronizedRootGroup
+
         public
 
         # @!group Helpers