Update maintainers (#1466)

Signed-off-by: Antón Casas <[email protected]>
(cherry picked from commit d88fdad)

Author: 4ntn

package.xml

@@ -4,6 +4,7 @@
   <name>micro_ros_raspberrypicosdk</name>
   <version>6.0.0</version>
   <description>micro-ROS tools for Raspberry Pico SDK</description>
-  <maintainer email="[email protected]">Pablo Garrido</maintainer>
+  <maintainer email="[email protected]">Eugenio Collado</maintainer>
+  <maintainer email="[email protected]">Carlos Espinoza</maintainer>
   <license>Apache License 2.0</license>
 </package>