Change mavlink branch submodule. #16

Job	Run time
formatting	7s
internal-tests (ardupilotmega)	52s
linting	1m 15s
internal-tests (asluav)	1m 2s
mavlink-dump	46s
internal-tests (matrixpilot)	1m 3s
msrv	2m 56s
internal-tests (minimal)	50s
internal-tests (paparazzi)	1m 2s
internal-tests (python_array_test)	1m 0s
internal-tests (slugs)	48s
internal-tests (standard)	25s
internal-tests (test)	50s
internal-tests (ualberta)	20s
internal-tests (uavionix)	20s
internal-tests (icarous)	49s
internal-tests (common)	49s
docs	0s
build	0s
test-embedded-size	0s
	15m 14s

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