add plist update function

lib/fastlane/plugin/ddg_apple_automation/helper/ddg_apple_automation_helper.rb

@@ -140,6 +140,7 @@ def self.prepare_release_branch(platform, version, other_action)
         update_embedded_files(platform, other_action)
         if platform == "ios"
           update_version_and_build_number_config(new_version, 0, other_action)
+          update_root_plist_version(new_version, other_action)
         else
           update_version_config(new_version, other_action)
         end
@@ -364,6 +365,19 @@ def self.update_version_and_build_number_config(version, build_number, other_act
         )
       end
 
+      def self.update_root_plist_version(version, other_action)
+        plist_path = File.expand_path("../DuckDuckGo/Settings.bundle/Root.plist", __dir__)
+
+        sh("/usr/libexec/PlistBuddy", "-c", "Set :PreferenceSpecifiers:0:DefaultValue #{version}", plist_path)
+
+        other_action.git_commit(
+          path: [plist_path],
+          message: "Update Root.plist version to #{version}"
+        )
+
+        UI.message("Updated Root.plist version to #{version}")
+      end
+
       def self.process_erb_template(erb_file_path, args)
         template_content = load_file(erb_file_path)
         unless template_content