Relax MSRV of utils to 1.38 #3096

Job	Run time
dependencies	12s
codegen	5s
clippy	16s
careful	40s
docs	12s
features (msrv)	33s
loom	50s
features (nightly)	14s
miri (channel)	2m 33s
rustfmt	4s
miri (others)	2m 31s
san	44s
shellcheck	8s
test (1.63, ubuntu-latest)	24s
test (1.63, windows-latest)	44s
test (stable, ubuntu-latest)	6s
test (stable, windows-latest)	1m 32s
test (nightly, ubuntu-latest)	14s
test (nightly, windows-latest)	24s
test (nightly, ubuntu-latest, i686-unknown-linux-gnu)	28s
test (nightly, ubuntu-latest, armv7-unknown-linux-gnueabihf)	35s
test (nightly, ubuntu-latest, armv5te-unknown-linux-gnueabi)	44s
	14m 13s

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