fix static analysis hints provided by IntelliJ

Author: Gubaer

src/main/java/org/openstreetmap/josm/plugins/scripting/ui/RunScriptAction.java

@@ -6,10 +6,12 @@
 
 import java.awt.event.ActionEvent;
 import java.awt.event.KeyEvent;
+import java.io.Serial;
 
 import static org.openstreetmap.josm.tools.I18n.tr;
 
 public class RunScriptAction extends JosmAction {
+    @Serial
     private static final long serialVersionUID = 1L;
 
     public RunScriptAction() {

src/main/java/org/openstreetmap/josm/plugins/scripting/ui/ScriptErrorViewerModel.java

@@ -5,6 +5,7 @@
 import java.beans.PropertyChangeListener;
 import java.beans.PropertyChangeSupport;
 
+@SuppressWarnings("unused")
 public class ScriptErrorViewerModel {
     /**
      * The name of the error property