Update MSRV check to account for features #538

Job	Run time
linting	1m 40s
mavlink-dump	52s
formatting	5s
msrv	59s
msrv (--features serde)	59s
msrv (--features tokio-1)	1m 0s
internal-tests (ardupilotmega)	1m 3s
internal-tests (asluav)	1m 16s
internal-tests (matrixpilot)	1m 17s
internal-tests (minimal)	1m 9s
internal-tests (paparazzi)	1m 16s
internal-tests (python_array_test)	1m 30s
internal-tests (slugs)	1m 1s
internal-tests (standard)	1m 10s
internal-tests (test)	1m 4s
internal-tests (ualberta)	1m 23s
internal-tests (uavionix)	1m 0s
internal-tests (icarous)	1m 1s
internal-tests (common)	1m 0s
docs	28s
build (macos-latest, x86_64-apple-darwin, --features ardupilotmega)	1m 35s
build (ubuntu-latest, arm-unknown-linux-musleabihf, --features ardupilotmega)	1m 57s
build (ubuntu-latest, armv7-unknown-linux-musleabihf, --features ardupilotmega)	1m 56s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega)	2m 11s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega,emit-description,emit-e...	2m 6s
build (ubuntu-latest, thumbv7m-none-eabi, --no-default-features --features embedded)	1m 18s
build (windows-latest, x86_64-pc-windows-msvc, --features ardupilotmega)	2m 55s
test-embedded-size	39s
	35m 50s

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