HSEARCH-4395 Remove the executableDependency block from the exec plug…

…in configuration

- since having it there isn't necessary as we don't need to filter out any plugin dependencies. We only have one, and it is the one we want to run.
Having the executableDependency leads to build error where maven cannot find version of jaxb-core dependency in root dependency management.

build/parents/public/pom.xml

@@ -278,10 +278,6 @@
                                 <configuration>
                                     <skip>${documentation.config.properties.skip}</skip>
                                     <mainClass>org.hibernate.search.configuration.properties.collector.impl.ConfigurationPropertyProcessor</mainClass>
-                                    <executableDependency>
-                                        <groupId>org.hibernate.search</groupId>
-                                        <artifactId>hibernate-search-configuration-properties-collector</artifactId>
-                                    </executableDependency>
                                     <arguments>
                                         <argument>${javadoc.org.hibernate.search.url}</argument>
                                         <argument>${project.build.directory}</argument>