Bump tokio from 1.37.0 to 1.38.0 #906

Job	Run time
check	7m 9s
matrix	1m 15s
test-client-check	3m 26s
test-client-matrix	47s
test-client-clippy	5m 19s
Build test client (x86_64-unknown-linux-musl)	6m 38s
Build test client (i686-unknown-linux-musl)	5m 43s
Build test client (armv7-unknown-linux-musleabihf)	6m 5s
Build test client (aarch64-unknown-linux-musl)	5m 0s
Build test client (x86_64-unknown-freebsd)	5m 24s
Build test client (.exe, x86_64-pc-windows-gnu)	6m 1s
tests	13m 8s
clippy	8m 11s
Check MSRV	7m 51s
build (x86_64-unknown-linux-musl)	5m 4s
build (i686-unknown-linux-musl)	11m 53s
build (armv7-unknown-linux-musleabihf)	12m 18s
build (aarch64-unknown-linux-musl)	12m 32s
build (x86_64-unknown-freebsd)	12m 24s
Package nightly release	12m 48s
	2h 28m 56s

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