Update MSRV check to account for features #547

Job	Run time
mavlink-dump	56s
linting	1m 39s
formatting	5s
internal-tests (ardupilotmega)	1m 6s
internal-tests (asluav)	1m 15s
msrv	31s
internal-tests (matrixpilot)	1m 23s
msrv (--features serde)	30s
internal-tests (minimal)	1m 4s
msrv (tokio-1)	15s
internal-tests (paparazzi)	1m 14s
internal-tests (python_array_test)	1m 33s
internal-tests (slugs)	1m 5s
internal-tests (standard)	1m 4s
internal-tests (test)	1m 3s
internal-tests (ualberta)	1m 14s
internal-tests (uavionix)	1m 0s
internal-tests (icarous)	1m 1s
internal-tests (common)	1m 3s
docs	27s
build	0s
test-embedded-size	0s
	19m 28s

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