Align plexus versions with latest stable Apache/Maven release

Author: mcculls

org.eclipse.sisu.plexus/pom.xml

@@ -70,17 +70,17 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-component-annotations</artifactId>
-      <version>1.5.5</version>
+      <version>2.1.0</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-classworlds</artifactId>
-      <version>2.5.2</version>
+      <version>2.6.0</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>
-      <version>3.0.17</version>
+      <version>3.3.0</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>