move dart2 test to the end

Author: wing328

pom.xml

@@ -978,7 +978,6 @@
             </activation>
             <modules>
                 <!-- clients -->
-                <module>samples/client/petstore/dart2/petstore</module>
                 <module>samples/client/petstore/haskell-http-client</module>
                 <module>samples/client/petstore/elm</module>
                 <module>samples/client/petstore/groovy</module>
@@ -1010,6 +1009,7 @@
                 <!--<module>samples/client/petstore/bash</module>-->
                 <module>samples/client/petstore/ruby</module>
                 <module>samples/server/petstore/rust-server</module>
+                <module>samples/client/petstore/dart2/petstore</module>
             </modules>
         </profile>
         <profile>