Refresh apt indices before rosdep install

[hello-jkoubi]

This prevents ROS package 404 errors caused by stale apt metadata while executing ./stretch_update_ros_workspace.sh:

Err:1 http://packages.ros.org/ros2/ubuntu jammy/main amd64 ros-humble-realsense2-camera-msgs amd64 4.56.4-2jammy.20251108.025541
  404  Not Found [IP: 2600:3402:200:227::2 80]
Err:2 http://packages.ros.org/ros2/ubuntu jammy/main amd64 ros-humble-realsense2-camera amd64 4.56.4-2jammy.20251118.225812
  404  Not Found [IP: 2600:3402:200:227::2 80]
Err:3 http://packages.ros.org/ros2/ubuntu jammy/main amd64 ros-humble-rtabmap-examples amd64 0.22.1-1jammy.20251119.021454
  404  Not Found [IP: 2600:3402:200:227::2 80]
Err:4 http://packages.ros.org/ros2/ubuntu jammy/main amd64 ros-humble-rtabmap-ros amd64 0.22.1-1jammy.20251119.022556
  404  Not Found [IP: 2600:3402:200:227::2 80]
E: Failed to fetch http://packages.ros.org/ros2/ubuntu/pool/main/r/ros-humble-realsense2-camera-msgs/ros-humble-realsense2-camera-msgs_4.56.4-2jammy.20251108.025541_amd64.deb  404  Not Found [IP: 2600:3402:200:227::2 80]
E: Failed to fetch http://packages.ros.org/ros2/ubuntu/pool/main/r/ros-humble-realsense2-camera/ros-humble-realsense2-camera_4.56.4-2jammy.20251118.225812_amd64.deb  404  Not Found [IP: 2600:3402:200:227::2 80]
E: Failed to fetch http://packages.ros.org/ros2/ubuntu/pool/main/r/ros-humble-rtabmap-examples/ros-humble-rtabmap-examples_0.22.1-1jammy.20251119.021454_amd64.deb  404  Not Found [IP: 2600:3402:200:227::2 80]
E: Failed to fetch http://packages.ros.org/ros2/ubuntu/pool/main/r/ros-humble-rtabmap-ros/ros-humble-rtabmap-ros_0.22.1-1jammy.20251119.022556_amd64.deb  404  Not Found [IP: 2600:3402:200:227::2 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
ERROR: the following rosdeps failed to install
  apt: command [sudo -H apt-get install -y ros-humble-rtabmap-ros] failed

Testing note:

I wasn’t able to reliably reproduce the original 404 error locally, as the affected ROS package versions are no longer present in the apt metadata.

It would be good to validate this fix the next time a similar transient ROS repo issue occurs.

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