Upgrade Maven Javadoc Plugin to 3.4.1

Closes: #104

Author: mdeinum

spring-batch-excel/pom.xml

@@ -130,7 +130,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
-                <version>3.2.0</version>
+                <version>3.4.1</version>
                 <executions>
                     <execution>
                         <id>attach-javadocs</id>