release: Update package.xml version to 2.1.0

package.xml

 <?xml version="1.0"?>
 <package format="2">
   <name>talos_data</name>
-  <version>2.0.0</version>
+  <version>2.1.0</version>
   <description>The talos_data package</description>
 
   <maintainer email="guilhem.saurel@laas.fr">Guilhem Saurel</maintainer>