dronekit.TimeoutError: wait_ready experienced a timeout after 30 seconds

Remove ‘import exceptions’, as it is not compatible with Python 3.

See
https://community.dojofordrones.com/t/ubuntu-20-python3-setup/304/12

https://community.dojofordrones.com/t/wsl2-instead-of-virtualbox/711

https://community.dojofordrones.com/t/full-gz-sim-on-22-04-lts/805