Update dependency org.apache.maven.plugins:maven-javadoc-plugin to v3.6.3

Author: renovate[bot]

pom.xml

@@ -108,7 +108,7 @@ SOFTWARE.
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>3.4.1</version>
+        <version>3.6.3</version>
         <configuration>
           <sourceFileIncludes>
             <include>Dummy.java</include>