[Java] Upgrade to javadoc-links 4.0.1.

Author: mjpt777

build.gradle

@@ -22,7 +22,7 @@ buildscript {
 plugins {
  id 'java'
  id 'com.gradle.build-scan' version '2.4.1'
- id 'io.freefair.javadoc-links' version '4.0.0' apply false
+ id 'io.freefair.javadoc-links' version '4.0.1' apply false
  id 'com.github.johnrengelman.shadow' version '5.1.0' apply false
 }