Update submodule jsbsim_bridge to latest Mon Sep 28 00:39:48 UTC 2020

    - jsbsim_bridge in PX4/Firmware (6a08e16): PX4/px4-jsbsim-bridge@efe19db
    - jsbsim_bridge current upstream: PX4/px4-jsbsim-bridge@d2cc31d
    - Changes: PX4/px4-jsbsim-bridge@efe19db...d2cc31d

    d2cc31d 2020-09-27 JaeyoungLim - Merge pull request #5 from mvacanti/pr-update-mag-latitude
9c76d93 2020-09-27 Matt Vacanti - JSBSim latitude type change to align with GPS inputs.
c5346be 2020-09-21 jaeyoung - Merge remote-tracking branch 'Auterion/master'
2d08df9 2020-09-18 JaeyoungLim - Merge pull request #7 from Auterion/pr-fix-gps-plugin
b791b45 2020-09-17 Matt Vacanti - Update LSZH.xml
1e7db59 2020-09-18 Matt Vacanti - Update sensor_gps_plugin.cpp
51524e2 2020-09-18 JaeyoungLim - Merge pull request #2 from mvacanti/master
8f330d8 2020-09-18 Matt Vacanti - Update sensor_gps_plugin.cpp
a5d4f69 2020-09-18 JaeyoungLim - Merge pull request #6 from Auterion/override_jsbsim_root
1b42b26 2020-09-18 Beat Küng - CMakeLists.txt: allow to override JSBSIM_ROOT_DIR via env variable
08770e4 2020-09-17 Matt Vacanti - Update LSZH.xml