robotiq_modbus_rtu: Cannot locate rosdep definition for [rospy]

The error "Cannot locate rosdep definition for [rospy]" typically occurs when `rosdep` is unable to find the definition for the `rospy` package. To address this issue, you can follow these steps:

1. Ensure that you have the `rosdep` package installed. If not, you can install it by running the following command:

   sudo apt-get install python-rosdep

2. Initialize `rosdep` by running the command:

   sudo rosdep init

3. Update `rosdep` by executing:

   rosdep update

4. Try resolving the `rospy` dependency again by running:

   rosdep install rospy

By following these steps, you should be able to resolve the "Cannot locate rosdep definition for [rospy]" error and successfully locate the `rosdep` definition for the `rospy` package.