Add python3-pykdl dependency for Ubuntu builds. (#658)
Add python3-pykdl dependency for Ubuntu builds. (#658)

We should use the system version when it is available, which
is the case for both Ubuntu Jammy and Ubuntu Focal.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@openrobotics.org>
ros2/ci,ros2/ci,ros2/ci