Multiple deck update issues

[knmcguire]

There have been issues of updating firmware of decks when multiple decks are attached. Here a compilation:

• https://github.com/bitcraze/crazyflie-firmware/issues/1291
• https://github.com/orgs/bitcraze/discussions/120
• https://github.com/bitcraze/crazyflie-clients-python/issues/616 (used to be closed but still seems to be an issue)