Update prerequisite to version 2.0.6 (inherited from parent), because we want to use a version of Plexus Utils that is newer than the one used in Maven Core.
Also make sure that the Maven Plugin API is for the same version of Maven.

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia/trunk@1293623 13f79535-47bb-0310-9956-ffa450edef68
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