Add missing actionlib exec_depend to package.xml

[Copilot]

The elevator_action_plugin uses actionlib::SimpleActionClient at runtime, but package.xml only declared actionlib as a build dependency.

Changes

• Added <exec_depend>actionlib</exec_depend> to robotnik_pad_plugins/package.xml following the pattern of other runtime dependencies (roscpp, pluginlib, etc.)

<build_depend>actionlib</build_depend>

<exec_depend>roscpp</exec_depend>
<exec_depend>pluginlib</exec_depend>
<exec_depend>robotnik_pad</exec_depend>
<exec_depend>robotnik_pad_msgs</exec_depend>
<exec_depend>actionlib</exec_depend>  <!-- Added -->

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