Update Kitodo/src/main/java/org/kitodo/production/KitodoProduction.java

Co-authored-by: Arved Solth <[email protected]>

Kitodo/src/main/java/org/kitodo/production/KitodoProduction.java

@@ -47,7 +47,7 @@ public class KitodoProduction implements ServletContextListener, HttpSessionList
     private static CompletableFuture<KitodoProduction> instance = new CompletableFuture<>();
     private ServletContext context;
     private Optional<Manifest> manifest;
-    private KitodoVersion version = new KitodoVersion();
+    private final KitodoVersion version = new KitodoVersion();
     private ActiveMQDirector activeMQDirector;
 
     /* This is the main() function. The class is instantiated by the servlet