Remove duplicate dependency from [dubbo-bom] and [dubbo-demo-xml-consumer] (#5799)

Author: LiosWong

dubbo-bom/pom.xml

@@ -374,11 +374,6 @@
                 <artifactId>dubbo-metadata-api</artifactId>
                 <version>${project.version}</version>
             </dependency>
-            <dependency>
-                <groupId>org.apache.dubbo</groupId>
-                <artifactId>dubbo-metadata-api</artifactId>
-                <version>${project.version}</version>
-            </dependency>
             <dependency>
                 <groupId>org.apache.dubbo</groupId>
                 <artifactId>dubbo-metadata-report-zookeeper</artifactId>

dubbo-demo/dubbo-demo-xml/dubbo-demo-xml-consumer/pom.xml

@@ -67,10 +67,6 @@
             <groupId>org.apache.dubbo</groupId>
             <artifactId>dubbo-metadata-report-nacos</artifactId>
         </dependency>
-        <dependency>
-            <groupId>org.apache.dubbo</groupId>
-            <artifactId>dubbo-metadata-report-zookeeper</artifactId>
-        </dependency>
         <dependency>
             <groupId>org.apache.dubbo</groupId>
             <artifactId>dubbo-config-spring</artifactId>