lms

Update toolchain and minor fixes #221

Job	Run time
check-for-todos	3s
msrv	2m 7s
rustfmt	13s
clippy	14s
set-msrv	3s
bench	39s
build (1.57, thumbv7em-none-eabi)	2m 47s
cross (1.57, aarch64-unknown-linux-gnu, default)	3m 10s
build (1.57, wasm32-unknown-unknown)	2m 43s
cross (stable, aarch64-unknown-linux-gnu, default)	3m 25s
build (stable, thumbv7em-none-eabi)	11s
test (1.57)	2m 35s
build (stable, wasm32-unknown-unknown)	13s
test (stable)	1m 33s
	19m 56s

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