Add missing dependency to gpio_controllers (ros-controls#1410)

Author: christophfroehlich

gpio_controllers/package.xml

@@ -4,10 +4,21 @@
   <name>gpio_controllers</name>
   <version>4.15.0</version>
   <description>Controllers to interact with gpios.</description>
-  <maintainer email="[email protected]">Maciej Bednarczyk</maintainer>
-  <maintainer email="[email protected]">Wiktor Bajor</maintainer>
+
+  <maintainer email="[email protected]">Bence Magyar</maintainer>
+  <maintainer email="[email protected]">Denis Štogl</maintainer>
+  <maintainer email="[email protected]">Christoph Froehlich</maintainer>
+  <maintainer email="[email protected]">Sai Kishor Kothakota</maintainer>
+
   <license>Apache License 2.0</license>
 
+  <url type="website">https://control.ros.org</url>
+  <url type="bugtracker">https://github.com/ros-controls/ros2_controllers/issues</url>
+  <url type="repository">https://github.com/ros-controls/ros2_controllers/</url>
+
+  <author email="[email protected]">Maciej Bednarczyk</author>
+  <author email="[email protected]">Wiktor Bajor</author>
+
   <buildtool_depend>ament_cmake</buildtool_depend>
 
   <depend>controller_interface</depend>
@@ -22,6 +33,7 @@
 
   <test_depend>ament_cmake_gmock</test_depend>
   <test_depend>controller_manager</test_depend>
+  <test_depend>hardware_interface_testing</test_depend>
   <test_depend>ros2_control_test_assets</test_depend>
 
   <export>