version-clj does not always match maven version sorting

A cljdoc user noticed that versions were not sorting according to Maven rules. https://github.com/cljdoc/cljdoc/issues/1092 Cljdoc was using `version-clj`. So is clj-watson. For cljdoc, I switched to using `org.apache.maven/maven-artifact`, which is lightweight and did the trick. Could do the same here for clj-watson.