Update MSRV check to account for features #531

Job	Run time
formatting	8s
linting	1m 33s
mavlink-dump	49s
internal-tests (ardupilotmega)	1m 18s
internal-tests (asluav)	1m 22s
msrv	2m 34s
internal-tests (matrixpilot)	1m 15s
msrv (--features serde)	2m 37s
internal-tests (minimal)	59s
msrv (--features tokio-1)	2m 19s
internal-tests (paparazzi)	1m 16s
internal-tests (python_array_test)	1m 19s
internal-tests (slugs)	1m 10s
internal-tests (standard)	1m 2s
internal-tests (test)	1m 0s
internal-tests (ualberta)	1m 18s
internal-tests (uavionix)	1m 1s
internal-tests (icarous)	59s
internal-tests (common)	1m 0s
docs	32s
build	0s
test-embedded-size	0s
	25m 31s

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