fix: do not run logging tests in parallel

[esteve]

This PR makes the logging tests run sequentially. Logging in ROS is not thread-safe as it uses global state, when cargo test runs these tests in parallel, sometimes cargo crashes with a SIGSEGV.

[esteve]

Perhaps a more complete approach would be to protect such global state inside rclrs, but these changes should suffice.

[esteve]

The issues with the rolling job are caused by action-ros-ci, I think the APT repos are not updated with the latest rolling sync.

[esteve]

Here's an example of a failing CI job crashing:

https://github.com/ros2-rust/ros2_rust/actions/runs/24464336823/job/71487081210?pr=625

error: test failed, to rerun pass `-p rclrs --lib`
  
  Caused by:
    process didn't exit successfully: `/__w/ros2_rust/ros2_rust/ros_ws/build/rclrs/debug/deps/rclrs-051c2c557ee4ff13 --color=never --quiet` (signal: 11, SIGSEGV: invalid memory reference)