Update submodule sitl_gazebo to latest Tue Apr 6 00:39:03 UTC 2021

- sitl_gazebo in PX4/Firmware (2a0a747598): e703e2726a
    - sitl_gazebo current upstream: 5761bd66cd
    - Changes: e703e2726a...5761bd66cd

    5761bd6 2021-04-05 Jaeyoung-Lim - Switch tailsitter sdf version to 1.6
This commit is contained in:
PX4 BuildBot
2021-04-06 00:39:03 +00:00
committed by Daniel Agar
parent 436a6fce38
commit f741606c60