Update submodule sitl_gazebo to latest Fri Jul  9 00:39:54 UTC 2021
Update submodule sitl_gazebo to latest Fri Jul  9 00:39:54 UTC 2021

    - sitl_gazebo in PX4/Firmware (7144566afe509e0ad8669d4f4690d22b7e176ed3): https://github.com/PX4/PX4-SITL_gazebo/commit/822050a7ab6fd87972e59f16312f451bce217a56
    - sitl_gazebo current upstream: https://github.com/PX4/PX4-SITL_gazebo/commit/1f3f1b1dec5a31c2c400f141fc344f11f68659c9
    - Changes: https://github.com/PX4/PX4-SITL_gazebo/compare/822050a7ab6fd87972e59f16312f451bce217a56...1f3f1b1dec5a31c2c400f141fc344f11f68659c9

    1f3f1b1 2021-06-18 Jonas Vautherin - Add plugin allowing to draw a force (e.g. liftdrag) (#771)

acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware