Bump org.apache.maven.plugins:maven-javadoc-plugin from 3.7.0 to 3.8.0 (

#1322)

Co-authored-by: Boni Garcia <boni.garcia@uc3m.es>

pom.xml

@@ -37,7 +37,7 @@
         <asciidoctorj-pdf.version>2.3.17</asciidoctorj-pdf.version>
         <maven-site.version>3.12.1</maven-site.version>
         <maven-project-info-reports.version>3.6.2</maven-project-info-reports.version>
-        <maven-javadoc-plugin.version>3.7.0</maven-javadoc-plugin.version>
+        <maven-javadoc-plugin.version>3.8.0</maven-javadoc-plugin.version>
 
         <!-- Java version -->
         <java.version>8</java.version>