Updates to Edition 2021 (#1513) #481

Job	Run time
Pass MSRV values to other jobs	2s
clippy/stable	26s
format/nightly	15s
nostd/thumbv6m-none-eabi/stable	20s
cross_test/s390x-unknown-linux-gnu/stable	6m 57s
cargo-careful	2m 16s
miri	8m 32s
docs/nightly	21s
cross_test/i686-unknown-linux-gnu/stable	1m 59s
blas-msrv	53s
tests/beta	3m 0s
tests/stable	2m 47s
tests/nightly	3m 18s
tests/1.64.0	4m 32s
conclusion	3s
	35m 41s

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