Usage: use newer artifact versions in the examples

Author: carlosame

usage.html

@@ -115,11 +115,11 @@ <h2>Modules</h2>
 </ul>
 <p>In general, you'll need to have at least <code>css4j</code>, <code>carte-util</code> and <code>tokenproducer</code> in your classpath/modulepath.
 If you use <a href="https://gradle.org/" target="_blank">Gradle</a> or <a href="https://maven.apache.org/" target="_blank">Apache Maven</a>, you may want to look at each module's
-<code>build.gradle</code> files (or even better, the <a href="https://css4j.github.io/maven/io/sf/carte/css4j-dom4j/4.2/css4j-dom4j-4.2.pom"><code>.pom</code></a>
-or the <a href="https://css4j.github.io/maven/io/sf/carte/css4j-dom4j/4.2/css4j-dom4j-4.2.module"><code>.module</code> files at the repository</a>) to check for the specific module dependencies.</p>
+<code>build.gradle</code> files (or even better, the <a href="https://css4j.github.io/maven/io/sf/carte/css4j-dom4j/6.1/css4j-dom4j-6.1.pom"><code>.pom</code></a>
+or the <a href="https://css4j.github.io/maven/io/sf/carte/css4j-dom4j/6.1/css4j-dom4j-6.1.module"><code>.module</code> files at the repository</a>) to check for the specific module dependencies.</p>
 <p>The latest <code>css4j-*</code> artifacts are generally compatible with <code>css4j</code> releases
 that have the same major version number and the same or larger minor version. For example
-<code>css4j-awt</code> 4.0 is compatible with <code>css4j</code> 4.0.1 and also with 4.2.2.</p>
+<code>css4j-awt</code> 6.0 is compatible with <code>css4j</code> 6.0 and also with 6.2.</p>
 <h3 class="subtema" id="gradle">Usage from a Gradle project</h3>
 <p>
 If your Gradle project depends on css4j, you can use this project's own Maven repository in a <code>repositories</code> section of