Bump org.apache.maven.plugins:maven-javadoc-plugin from 3.7.0 to 3.8.0 (#958)

pom.xml

@@ -309,7 +309,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-javadoc-plugin</artifactId>
-          <version>3.7.0</version>
+          <version>3.8.0</version>
           <configuration>
             <quiet>true</quiet>
             <doclint>-missing</doclint>