Add optional dependency to annotation processor

This ensures in a parallel full rebuild the APT module is build before
the module using it.

org.eclipse.scout.rt.server.jaxws.test/pom.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-  ~ Copyright (c) 2010, 2023 BSI Business Systems Integration AG
+  ~ Copyright (c) 2010, 2024 BSI Business Systems Integration AG
   ~
   ~ This program and the accompanying materials are made
   ~ available under the terms of the Eclipse Public License 2.0
@@ -68,6 +68,7 @@
     <dependency>
       <groupId>org.eclipse.scout.rt</groupId>
       <artifactId>org.eclipse.scout.jaxws.apt</artifactId>
+      <scope>provided</scope>
       <optional>true</optional>
     </dependency>