try to fix log4j-bom dependency

git-svn-id: https://svn.apache.org/repos/asf/xmlbeans/trunk@1922283 13f79535-47bb-0310-9956-ffa450edef68

Author: pjfanning

src/main/maven/org.apache.xmlbeans/xmlbeans/pom.xml

@@ -81,6 +81,8 @@
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-bom</artifactId>
             <version>2.24.2</version>
+            <type>pom</type>
+            <scope>import</scope>
         </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>