Prepare for MSRV increase #463

Job	Run time
build (ubuntu-latest)	58s
build (windows-latest)	1m 57s
build-other (x86_64-unknown-freebsd, 1.74.0)	1m 7s
test (macos-latest, 1.74.0)	2m 43s
build-other (x86_64-unknown-freebsd, stable)	56s
test (macos-latest, stable)	2m 25s
build-other (x86_64-unknown-freebsd, beta)	51s
test (macos-latest, beta)	2m 32s
build-other (x86_64-unknown-freebsd, nightly)	56s
test (macos-latest, nightly)	2m 24s
build-other (x86_64-unknown-illumos, 1.74.0)	1m 4s
test (ubuntu-latest, 1.74.0)	4m 4s
build-other (x86_64-unknown-illumos, stable)	53s
test (ubuntu-latest, stable)	3m 55s
build-other (x86_64-unknown-illumos, beta)	54s
test (ubuntu-latest, beta)	3m 58s
build-other (x86_64-unknown-illumos, nightly)	1m 16s
test (ubuntu-latest, nightly)	3m 55s
test (windows-latest, 1.74.0)	4m 44s
test (windows-latest, stable)	4m 29s
test (windows-latest, beta)	4m 28s
test (windows-latest, nightly)	4m 18s
	54m 47s

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